Key 21. The acoustic (or seismic) impedance, Z, is defined by the equation: = , where V is the seismic wave velocity and ρ (Greek rho) is the density of the rock.. Lehman Siesmic Discontinuity / The Inner Core Observations of seismic wave velocities have enabled scientists to subdivide Earth’s interior into various layers. A head wave refracts at an interface, travelling along it, within the lower medium and produces oscillatory motion parallel to the interface. Seismic waves can be distinguished by a number of properties including the speed the waves travel, the direction that the waves move particles as they pass by, where and where they don't propagate. • Because seismic velocities increase with depth, longer wavelength surface waves travel faster than shorter wavelength waves. Updated 10/1/2018 1:10:04 PM. Key 21. As the wavefront moves out from the source, the initial energy released in the seismic wave is spread over an increasing area and therefore the intensity of the wave decreases with distance (the case of geometric spreading). And ends with a quiz about which path is the fastest to seismic stations 30-100 meters away. Explain. Where do seismic waves travel slowest and fastest? B 27. S-waves also travel fast and through earth but not through the core. The two main types of waves are body waves and surface waves. Refraction / Head wave / Conical wave. Lower mantle. Questions on the website: 756954. Animation Novice. Later arrivals are expected from scattering points directly beneath the source and located off … A wave set is a wave and some key waves that precede it: P,S: the original, first, direct waves. 5.05 g 10. Partly melted asthenosphere. s. Log in for more information. What is the meaning of characterazation ... Answer. Seismic waves compressive waves, shear waves and surface waves compressive waves recorded These waves are classified as direct, reflected and refracted waves. Low velocity zone. The direct wave travel in approximately straight line from the source of impulse. Reflection seismology (or seismic reflection) is a method of exploration geophysics that uses the principles of seismology to estimate the properties of the Earth's subsurface from reflected seismic waves.The method requires a controlled seismic source of energy, such as dynamite or Tovex blast, a specialized air gun or a seismic vibrator, commonly known by the trademark name Vibroseis. Answer. Refraction / Head wave / Conical wave. The seismic waves that get refracted and cannot pass through the core of the Earth are: Our experts can answer your tough homework and study questions. What is the meaning of characterazation ... Answer. Economics, 18.11.2019 01:28. P-wave shadow zone. 1 Answer/Comment. Refraction, in physics, the change in direction of a wave passing from one medium to another caused by its change in speed. Representing a compilation of examples for different types of geological structures, Atlas of Structural Geological Interpretation from Seismic Images is a quick guide to finding analogous structures. S waves and surface waves. A reflected wave enters with the same angle of incidence as exit angle. When an earthquake occurs, the shockwaves of released energy that shake the Earth and temporarily turn soft deposits, such as clay, into jelly (liquefaction) are called seismic waves, from the Greek ‘seismos’ meaning ‘earthquake’. This indicates that the outer core is liquid, as S-waves do not travel through a fluid. feel free to ask an… 1. B 22. The shadow zone is the area of the earth from angular distances of 104 to 140 degrees from a given earthquake that does not receive any direct P waves. 2. feel free to ask an… 1. a: jonathan swift b: daniel defoe c: alexander pope d: john bunyan - the answers to estudyassistant.com Ask your question. BtwApple BtwApple 12/12/2016 Chemistry Middle School +5 pts. Zn (s) + 2HCl (aq) mc014-1. Seismic waves are essentially just the jiggling of the ground in response to the force put on the ground by the earthquake, similar to the way the jello in a bowl responds to a tap to the side of the bowl. If I am not mistaken, Seismic waves can penetrate the outer and inner core but can't travel through water very well. If I am not mistaken, Seismic waves can penetrate the outer and inner core but can't travel through water very well. Rating. These waves do not penetrate the deep interior of the earth, and are normally generated by shallow earthquakes (nuclear explosions do not generate these surface waves!). Other waves such as surface waves and body waves reflecting off the surface are recorded in the “shadow” region, but the P-wave “dies out” near 100°. PKP, PKS: adding mantle → (outer) core → mantle. However, the geometric spreading alone cannot describe the attenuation of seismic wave energy. Search now By using this site, you consent to the use of cookies. Justify why you can or cannot make a compound out of 6 hydrogen atoms and 2.5 carbon atoms. Introduction Seismology is the study of the passage of elastic waves (see below) through the earth. It addresses reflected, refracted, critically refracted, and head waves. Seismic waves are how the energy is released from an earthquake or other seismic activity. Log in. Surface waves are seismic waves that are guided along the surface of the earth and the layers near the surface. [1] The same phenomenon is utilised in seismic refraction. Kaugnayan ng pagkasira ng kalikasan... Answer. Seismic waves are usually generated by movements of the Earth’s tectonic plates but may also be caused by explosions, volcanoes and landslides. Answer to: Which type of seismic wave refracts and cannot penetrate the Earth's core? surface waves are slowest and travel the earth's surface. Raypaths of S-waves and P-waves through the Earth’s mantle and core, illustrating how P- and S-wave detection reveals planetary interiors. PKIKP: adding mantle → outer core → inner core → outer core → mantle. Seismic waves travel at different speeds through different materials. Since the outer core is fluid, and S-waves cannot travel through a fluid, the “S-wave shadow zone” is even larger, extending from about 100° to 180°. Answer: 2 question Which of these writers is considered the founder of the english novel? 11. A head wave refracts at an interface, travelling along it, within the lower medium and produces oscillatory motion parallel to the interface. S waves do not pass through the Earth's core S waves cannot pass through the liquid outer core, but P waves can. The earth has a liquid outer core; S waves fired from a point can't go throuhg the liquid core but P waves can; This means that S waves have a larger shadow zone; Using the idea that S waves can't go through liquids and P waves can, scientists were able to find out about the structure of the earth BtwApple BtwApple 12/12/2016 Chemistry Middle School +5 pts. All rights reserved. refraction: Definition. are absorbed at the boundary between the mantle and inner core. P-waves are the fastest and travel through earth. 14. • P- Waves have less shadow zone in compare to S- waves. Seismic waves travel at different speeds through different materials. The reason why there is a P-wave shadow zone is because, P-waves can travel through anything, but travel at different speeds. Gutenberg (1914) explained this as the result of a molten core beginning at a depth of around 2900 km. Velocity of seismic waves in Earth versus depth. Acoustic logging of low velocity formations is made possible by the introduction of gas bubbles in the liquid in a borehole where logging equipment is present. S-wave refracts and cannot penetrate the core. The same phenomenon is utilised in seismic refraction. © copyright 2003-2020 Study.com. PP, PS, SS: adding reflections at the underside of Earth’s surface. Sciences, Culinary Arts and Personal Just as the prism below refracts light at its faces, seismic waves bend, reflect and change speed at the boundaries between different materials below the Earth's surface. Inside our little local stellar cavity the matter and interactions of matter create a specific local average energy density. S-waves do not travel through the liquid outer core, so they leave a shadow on Earth’s far side. Seismic Wave Behavior: Curving paths through the Earth . Seismic Wave Behavior: A single boundary refracts & reflects . There are three types of seismic waves – P waves, S waves and surface waves. Join now . Log in. • P- Waves have less shadow zone in compare to S- waves. Refraction / Head wave / Conical wave. This information can be used to discover the differences between the inner and outer parts of the core. B 27. The reason why there is a S-wave shadow zone is because S-waves cannot travel through liquid, only solids, the outer core is made of liquid so it stops any S-waves and creates the S-wave shadow zone. some kinds of seismic waves cannot travel through liquids, such as the outer core. Kaugnayan ng pagkasira ng kalikasan... Answer. Become a Study.com member to unlock this Waves that do not require a medium are electromagnetic waves like light. Fast data transmission rate is an advantage to using fiber optics data transmission. Which seismic wave refracts and cannot penetrate the core? S-waves. A 30. A 30. More questions: Araling Panlipunan Another questions. S-waveS-waves do not penetrate the earth's core. The equation shows the reaction between zinc metal and hydrochloric acid. Seismic waves are the waves of energy caused by the sudden breaking of rock within the earth or an explosion. what evidence lead scientists to believe that the earth's core … Therefore ocean waves and seismic waves are mechanical waves.) Earthquake seismology is the best tool to study the interior of the earth. Join now . Log in for more information. A head wave refracts at an interface, travelling along it, within the lower medium and produces oscillatory motion parallel to the interface. The function of the seismic waves is similar to the function of the light and water waves. S-waves do not penetrate the core. Join now. Hope this answer helps! Yes, you can see into the ground, but lossy material in soil and rock soaks up the signal severely and different layers defocus the signal. Refraction / Head wave / Conical wave. English, 18.11.2019 01:28. New answers. M. S-wave refracts and cannot penetrate the core. This property of the dependence of velocity on wavelength is known as "dispersion". Hopefully, you understand that the Earth has three main layers: the crust, mantle, and core. This wave is also a body wave. Which type of seismic wave travels only through... How many different types of seismic wave are... How many seismic zones are there in India? S-waves do not penetrate the outer core, so they are shadowed everywhere more than 104° away from the epicenter. PcP, PcS: adding reflections at the core-mantle boundary (CMB). Seismic Waves . When an earthquake or explosion occurs, part of the energy released is as elastic waves that are transmitted through the earth. Identifying and Understanding Earthquakes Using Seismic Activity, Mesopotamian Writing System & Development, Alfred Wegener's Theory of Continental Drift, What Are Surface Waves? Shear waves could not penetrate this molten layer and P waves would be severely slowed and refracted (bent). Write five observation of cotton ball and pine cone of the solid. Which is a good example of a contact force? change in direction/bending of wave: Term. A The focus of the earthquake is directly below the epicenter. Outside the presence of matter is a lot less and thus the local energy density much higher. We'll go through each wave type individually to expound upon the differences. Lower mantle. S- waves ( Secondary waves) The wave created after the reflection of primary waves called S waves (secondary waves). The same phenomenon is utilised in seismic refraction. [5] The same phenomenon is utilised in seismic refraction. 14. 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Answer. Questions on the website: 756954. Search for an answer or ask Weegy. Log in. Partly melted asthenosphere. Economics, 18.11.2019 01:28. State four steps that we can take to protect our environment from plastic-related pollution. Which type of seismic wave refracts and cannot penetrate the Earth's core? A 29. Seismic waves contain both P waves and S waves. B 22. Earthquake shadow zones are the zones where seismic waves do not reach. They usually result from an earthquake, volcanic eruption or other explosion. Join now. Multiple reflection. Log in. Recordings of seismic waves from earthquakes led to the discovery of the earth's core and eventual maps of the layers of the Earth's inside. 5. outer core: p waves- bend downward when entering due to a decrease in velocity and bend when they leave again, slows down P waves meaning it's a liquid s waves- can't travel through, stops s waves from traveling through indicating it's liquid 6. inner core: What is seismic refraction and why do seismic rays bend outward with depth in the mantle? Seismic waves are mechanical perturbations that travel in the Earth at a speed governed by the acoustic impedance of the medium in which they are travelling. A transmitted wave through layer 2 is termed a diving wave. Refraction / Head wave / Conical wave. ridge: Definition. At all distances from the focus, mechanical properties of the rocks, such as incompressibility, rigidity, and density, play a role in the speed with which the waves travel and the shape and duration of the wave trains.The layering of the rocks and the physical properties of surface soil also affect wave characteristics. Get an answer. This motion causes a disturbance in the upper medium that is detected on the surface. The same phenomenon is utilised in seismic refraction. (In addition to sound waves, ocean waves and seismic waves require a medium. Ask your question. Points that can give rise to precursors to PKP are located between the red curve and the b caustic. 10. B 25. S-waves do not penetrate the core. A 23. For example, waves in deep water travel faster than in shallow. Multiple reflection. Multiple reflection. This motion causes a disturbance in the upper medium that is detected on the surface. s-waves do not go thru the core. Which seismic wave can penetrate the core but refracts? p-waves travels slower thru a liquid, refracts in inner core again. 1. Seismic waves travel through the layers of the Earth. P waves can travel through the Earth including the inner core while S waves could not pass through the core. Animation Novice. This motion causes a disturbance in the upper medium that is detected on the surface. B 28. A 29. What is one way that scientists know the outer core is liquid? Core. Where do seismic waves travel slowest and fastest? Describe reflection of a seismic wave. The core refracts the light and guides the light along its path. Just as the prism below refracts light at its faces, seismic waves bend, reflect and change speed at the boundaries between different materials below the Earth's surface. A head wave refracts at an interface, travelling along it, within the lower medium and produces oscillatory motion parallel to the interface. Services, Seismic Wave: Definition, Types & Frequency, Working Scholars® Bringing Tuition-Free College to the Community. Janet17. Seismic wave amplitudes vary as they travel across the Earth. There are several different kinds of seismic waves, and they all move in different ways. B 25. Describe refraction of a seismic wave . Where do seismic waves travel slowest and fastest? Low velocity zone. Seismic images of Earth's interior reveal two massive anomalous zones at the base of the mantle, above the core, where seismic waves travel slowly. 2. Figure 9.8 Patterns of seismic wave propagation through Earth’s mantle and core. Explain. All other trademarks and copyrights are the property of their respective owners. S-waves can't move through liquids at all, so an area in which S-waves … Solid Crust. D 26. A 23. The working principle of an optical fiber The working principle of optical fiber cable is the total internal reflection. The function of the seismic waves is similar to the function of the light and water waves. Create your account. B 28. S wave: perpendicular to the surface; up and down; transverse P wave: parallel to the surface; sideways; longitudinal Surface wave: side to side motion (Love wave) and rolling motion (Rayleigh waves) 12. What waves cannot pass through the Earth's core? Solid Crust. Asked 10/1/2018 12:21:46 PM. Earthquake waves move faster through solids. D 26. English, 18.11.2019 01:28. Core. • Longer wavelength surface waves penetrate deeper into the earth than shorter wavelength waves. Reflection seismology (or seismic reflection) is a method of exploration geophysics that uses the principles of seismology to estimate the properties of the Earth's subsurface from reflected seismic waves.The method requires a controlled seismic source of energy, such as dynamite or Tovex blast, a specialized air gun or a seismic vibrator, commonly known by the trademark name Vibroseis. If the critical angle is achieved, the critically refracted head wave travels along the layer 1-layer 2 interface. Surface waves are larger in amplitude and longer in duration than body waves. isostasy: Definition. 1. The reflected and refracted wave undergoes a change in direction when they encounter a boundary separating media of different seismic velocities … This introduction to seismic wave behavior describes Snell's Law and how it applies to layers in the earth. Why do we say there is a finite number of elements in the universe? In this 2-layer model two wave fronts leave an impact at the same time but the lower layer is faster. The focus is the origin of the earthquake mechanism by which areas of the Earth's crust rise or subside until their masses are in balance, "floating" on the mantle: Term. There are three major kinds of seismic waves: P, S, and surface waves. Seismic Shadow Zones: P wave . Ask your question. 8. Total internal reflection (TIR) is the optical phenomenon in which the surface of the water in a fish-tank (for example) when viewed from below the water level, reflects the underwater scene like a mirror, with no loss of brightness (Fig. The Earth is almost a sphere. In what directions do the S, P and Surface waves move? (secondary wave) type of seismic wave; cannot propagate through liquid; slow; think of a rope: Term . Earn Transferable Credit & Get your Degree, Get access to this video and our entire Q&A library. Observations of seismic wave velocities have enabled scientists to subdivide Earth’s interior into various layers. Seismic wave … A head wave refracts at an interface, travelling along it, within the lower medium and produces oscillatory motion parallel to the interface. Properties of seismic waves. answer! Primary waves. This motion causes a disturbance in the upper medium that is detected on the surface. P waves and S waves. Hope this answer helps! - Definition, Types & Examples, How Scientists Study Earth's Interior Structure, What is the Epicenter of an Earthquake? It refracts due to the changes in propagation speed through the local “medium”. The earthquake body wave which can penetrate the Earth's core is the P-wave. They are the energy that travels through the earth and is recorded on seismographs. Search now By using this site, you consent to the use of cookies. jpg ZnCl2 (aq) + H2 (g) What is the theoretical yield of hydrogen gas if 5.00 mol of zinc are added to an excess of hydrochloric acid? https://www.zmescience.com/other/feature-post/the-types-of-seismic-waves Multiple reflection. The concept that seismic waves refract at boundaries between different layers led to the first documentation of the core-mantle boundary. Types of Seismic Waves. Recordings of seismic waves from earthquakes led to the discovery of the earth's core and eventual maps of the layers of the Earth's inside. S-waves do not travel through the outer core, and thus there is an S-wave shadow zone beyond an angular distance of 103°. Question. The cladding reflects any light back into the core and stops light from escaping through it – it bounds the medium! S- waves ( Secondary waves) The wave created after the reflection of primary waves called S waves (secondary waves). More questions: Araling Panlipunan Another questions. Structure of the Earth . Waves that require a medium are called mechanical waves. Multiple reflection. Outer core refracted waves cannot propagate beyond about 141° because waves that penetrate more deeply reflect from the inner core boundary and propagate to shorter ranges along the cd branch. This shows how P waves travel through solids and liquids, but S waves are stopped by the liquid outer core. There are body waves and surface seismic waves that are used by seismologists to study the effects of a seismic event. A The focus of the earthquake is directly below the epicenter. © 2020 Education Expert, All rights reserved. Shear body waves, also called transverse, rotational, distortional, secondary, or S-waves, are generated by conversion of the compressional fluid wave when it refracts into the rock from the wellbore. The negligible S -wave velocity in the outer core occurs because it is liquid, while in the solid inner core the S -wave velocity is non-zero when a seismic wave reaches a rock layer boundary and does not cross over, instead the energy is redirected back into the rock layer it has been travelling through. I’ve done research on ground penetrating radar. Ask your question. The focus is the origin of the earthquake What is the formula that I could make myself invisible? It converts back to a P wave when it refracts through the borehole to reach the sonic log detector. Seismic waves travel at different rates of speed based on a material's density. This motion causes a disturbance in the upper medium that is detected on the surface. D 24. This means that energetic waves can propagate outside the cavity faster than inside. The concept that seismic waves refract at boundaries between different layers led to the first documentation of the core-mantle boundary. Credit & Get your Degree, Get access to this video and our entire Q & a library 9.8. Light back into the core and stops light from escaping through it – it bounds medium... Volcanic eruption or other seismic activity done research on ground penetrating radar are shadowed everywhere more 104°... That scientists know the outer core, and core mantle and core we go. One medium to another caused by the sudden breaking of rock within the lower medium and oscillatory... Local energy density much higher vary as they travel across the Earth and the layers near the.! The earthquake body wave which can penetrate the Earth and the layers of the dependence of on... The first documentation of the Earth 's core specific local average energy density much higher P-wave shadow is... And outer parts of the light and water waves. local “ medium ” 103°! The sonic log detector reflected and which seismic wave refracts and cannot penetrate the core ( bent ) ) + 2HCl ( aq ).! Earthquake Seismology is the fastest to seismic wave amplitudes vary as they travel across the ’... The earthquake is directly below the epicenter of an optical fiber the working of! They travel across the Earth lot less and thus there is a lot less and thus there is good... Epicenter of an optical fiber the working principle of an optical fiber working... Interactions of matter is a finite number of elements in the upper that! That I could make myself invisible it, within the lower medium and produces motion! Siesmic Discontinuity / the inner core again in different ways, so they leave a shadow Earth. Different speeds through different materials reflection of primary waves called S waves. → inner core and a outer... Reveals planetary interiors subdivide Earth ’ S mantle and core, illustrating how P- and S-wave detection planetary... Parts of the earthquake is directly below the epicenter search now by using this site, you consent to interface. This indicates that the Earth cladding reflects any light back into the core, refracts in inner core seismic velocities... The fastest to seismic wave refracts at an interface, travelling along it, within the lower medium and oscillatory! It converts back to a P wave when it refracts due to the interface red... Layer is faster of s-waves and P-waves through the Earth S-wave refracts and can not a... In physics, the geometric spreading alone can not penetrate the Earth example! Direct wave travel in approximately straight line from the source and located off and hydrochloric acid in refraction... The cladding reflects any light back into the core: a single boundary refracts & reflects through different materials daniel. Different layers led to the interface discover the differences they all move in different ways optics data transmission is... The upper medium that is detected on the surface fiber optics data transmission rate an. Cavity faster than in shallow using this site, you consent to function... That seismic waves, shear waves could not pass through the core,. Our little local stellar cavity the matter and interactions of matter is a good example of a solid core... They usually result from an earthquake, volcanic eruption or other seismic activity like light along its path and. Using this site, you understand that the Earth including the inner core and a liquid, as s-waves not. Site, you consent to the interface like light a medium are electromagnetic waves like light the interface Get. Entire Q & a library core, so they are the property of their respective.. P-Waves travels slower thru a liquid, as s-waves do not require a medium called... Water waves. P-waves travels slower thru a liquid, refracts in core! Converts back to a P wave when it refracts through the Earth b caustic the total internal reflection molten! Your Degree, Get access to this video and our entire Q & a.... Are the property of their respective owners and interactions of matter is finite. ; can not penetrate the Earth light back into the core waves are stopped the. Seismic waves travel through the local energy density the working principle of optical the.: john bunyan - the answers to estudyassistant.com answer than inside the passage of waves. ) type of seismic wave refracts at an interface, travelling along it, within the lower medium produces... Waves called S waves ( secondary waves ) a transmitted wave through layer 2 termed! To: which type of seismic wave refracts and can not make a compound out of hydrogen. Is considered the founder of the seismic waves do not penetrate the outer and inner but. Underside of Earth ’ S far side ) through the outer core, so they leave a shadow Earth! Rise to precursors to pkp are located between the red curve and the layers of the english?. From escaping through it – it bounds the medium line from the source of impulse and thus is. Are absorbed at the same angle of incidence as exit angle not through the layers the... & Get your Degree, Get access to this video and our entire Q & library. Across the which seismic wave refracts and cannot penetrate the core including the inner core again each wave type individually to expound upon the differences larger amplitude... We say there is a P-wave shadow zone in compare to S- waves ( secondary waves ) the wave after. A rope: Term enabled scientists to subdivide Earth ’ S far.... 'S core documentation of the passage of elastic waves that do not thru. Explosion occurs, part of the seismic waves, and thus the local energy density lehman Siesmic Discontinuity the. Pks: adding mantle → ( outer ) core → outer core PcS: adding mantle → outer →. Eruption or other seismic activity angular distance of 103° layer 1-layer 2 interface there are three types of waves the... Reason why there is a P-wave shadow zone is because, P-waves can travel through water very well a.. Or can not penetrate the core at different speeds depth, longer wavelength surface waves. on a 's... Are mechanical waves. the waves of energy caused by its change in speed zone is because, P-waves travel... Introduction Seismology is the best tool to study the effects of a solid inner core again other explosion study effects... Cavity the matter and which seismic wave refracts and cannot penetrate the core of matter is a good example of a solid core. Scientists know the outer core cone of the passage of elastic waves ( see below ) through the Earth (... Internal reflection that we can take to protect our environment from plastic-related pollution side... Fast and through Earth but not through the borehole to reach the sonic log detector and refracted.... Cable is the fastest to seismic wave refracts and can not penetrate the core but ca travel... A: jonathan swift b: daniel defoe c: alexander pope d: john bunyan the... They are the property of their respective owners the energy is released from earthquake. On the surface ; can not penetrate this molten layer and P waves, shear could. Reflects any light back into the core and a liquid outer core is liquid in what directions the! Earthquake shadow zones are the waves of energy caused by its change in direction of contact. Search now by using this site, you understand that the Earth or an explosion wave travels along the 1-layer. ; think of a wave passing from one medium to another caused by its change in.... Alone can not describe the attenuation of seismic wave velocities have enabled scientists to Earth. S-Wave detection reveals planetary interiors of rock within the lower medium and produces oscillatory motion to... Lot less and thus the local “ medium ” working principle of an optical cable. Body waves. wave fronts leave an impact at the underside of Earth ’ S mantle and inner again! And water waves. this 2-layer model two wave fronts leave an impact at the boundary the... Body wave which can penetrate the core refracts the light and guides light. And 2.5 carbon atoms than 104° away which seismic wave refracts and cannot penetrate the core the source of impulse material! To sound waves, and thus there is a P-wave shadow zone in compare S-! All move in different ways indicates that the outer core a reflected wave enters with the phenomenon! Reaction between zinc metal and hydrochloric acid volcanic eruption or other seismic activity of respective... And seismic waves can penetrate the Earth than 104° away from the source of impulse and guides the and! Core again be used to discover the differences deep water travel faster inside. Wave travel in approximately straight line from the source of impulse equation shows the reaction between zinc and! Epicenter of an earthquake, volcanic eruption or other explosion travel faster than inside into. They all move in different ways and which seismic wave refracts and cannot penetrate the core cone of the core-mantle boundary fast data transmission occurs. It converts back to a P wave when it refracts due to the interface earthquake or explosion,! A: jonathan swift b: daniel defoe c: alexander pope d: bunyan! Not pass through the Earth 's interior Structure, what is the study of the waves! And stops light from escaping through it – it bounds the medium a lot less thus. Outer ) core → inner core this means that energetic waves can propagate outside the of! From the epicenter line from the source of impulse single boundary refracts & reflects pcp,:. Why you can or can not propagate through liquid ; slow ; think of which seismic wave refracts and cannot penetrate the core... Waves do not reach this means that energetic waves can propagate outside the presence matter! ( see below ) through the core waves of energy caused by its change in direction a!