A SITE AMPLIFICATION STUDY USING OBSERVED RECORDS AT
... than 1 sec., whereas they have amplitudes from 3 to 5 in the shorter period range. Horizontal transfer function Hs/Hb for earthquake motions has clear peaks but that of microtremor show a broad peaks perhaps due to difference of wave contents mentioned above. There are various problems to be solved ...
... than 1 sec., whereas they have amplitudes from 3 to 5 in the shorter period range. Horizontal transfer function Hs/Hb for earthquake motions has clear peaks but that of microtremor show a broad peaks perhaps due to difference of wave contents mentioned above. There are various problems to be solved ...
Deep reflection seismic experiments in western Poland
... boundaries have been created by mu1tiple oscillation seismic waves between superjacent boundaries. Different seismograms have been obtained from d i h t parts of the profile. Tn some ofthem reflectors are aasiIy legible, in others they are affected by strong interference, and in o h u s the signal-t ...
... boundaries have been created by mu1tiple oscillation seismic waves between superjacent boundaries. Different seismograms have been obtained from d i h t parts of the profile. Tn some ofthem reflectors are aasiIy legible, in others they are affected by strong interference, and in o h u s the signal-t ...
Lecture 12 Earthquake Magnitude October 20th
... Prior to 1935 the estimation of the intensity of an earthquake was base on a qualitative and subjective interpretation of the Mercalli Intensity Scale. Charles Richter (1935) devised a quantitative method based on the amplitude of the largest waves recorded on a seismogram. The size of the amp ...
... Prior to 1935 the estimation of the intensity of an earthquake was base on a qualitative and subjective interpretation of the Mercalli Intensity Scale. Charles Richter (1935) devised a quantitative method based on the amplitude of the largest waves recorded on a seismogram. The size of the amp ...
Earthquake Powerpoint
... rupture occurs • EPICENTER = geographic point on surface directly above focus • SEISMIC WAVES produced by the release of energy – move out in circles from the point of rupture (focus) – 2 types: surface & body (travel inside & through earth’s layers) • P waves: back and forth movement of rock; trave ...
... rupture occurs • EPICENTER = geographic point on surface directly above focus • SEISMIC WAVES produced by the release of energy – move out in circles from the point of rupture (focus) – 2 types: surface & body (travel inside & through earth’s layers) • P waves: back and forth movement of rock; trave ...
Finding an earthquake epicenter Geologists who study earthquakes
... crust. Within minutes of an earthquake, seismographs would record the arrival times of the P-waves and S-waves. Since P-waves travel faster than s-waves, if there is a longer period of time from when the P-waves arrive to when the S-waves arrive, you know that the epicenter is located farther from t ...
... crust. Within minutes of an earthquake, seismographs would record the arrival times of the P-waves and S-waves. Since P-waves travel faster than s-waves, if there is a longer period of time from when the P-waves arrive to when the S-waves arrive, you know that the epicenter is located farther from t ...
AF083-264
... More recently, there have been some publications in alternative methods, employing non-contact optical measurements made possible by the laser Doppler vibrometer (LDV). It measures vibration at the point where the laser beam is incident on the surface. The instrument is, however, costly (typ. $250,0 ...
... More recently, there have been some publications in alternative methods, employing non-contact optical measurements made possible by the laser Doppler vibrometer (LDV). It measures vibration at the point where the laser beam is incident on the surface. The instrument is, however, costly (typ. $250,0 ...
Auxiliary Material
... S2, truncated at degree 40. The absolute scale is dependent on the scalar moment. Only relative amplitudes among various excitation functions can be compared. The gravity change from any double-couple source at one of the three depths is simply a linear combination of those maps. The coseismic gravi ...
... S2, truncated at degree 40. The absolute scale is dependent on the scalar moment. Only relative amplitudes among various excitation functions can be compared. The gravity change from any double-couple source at one of the three depths is simply a linear combination of those maps. The coseismic gravi ...
Where was the earthquake?
... • Underground tectonic plates push past each other, building up pressure. • This pressure is suddenly released along faults (cracks in the crust), sending out a huge pulse of energy. • This travels out in all directions as earthquake ...
... • Underground tectonic plates push past each other, building up pressure. • This pressure is suddenly released along faults (cracks in the crust), sending out a huge pulse of energy. • This travels out in all directions as earthquake ...
earthquake . ppt - Junction Hill C
... There is no pattern. • Fiction: There is such a thing as "earthquake weather." Fact: There is no connection between earthquakes and weather. Remember, earthquakes happen deep in the earth, far away from the weather! • Fiction: Earthquakes are on the increase. Fact: It may seem like we’re having more ...
... There is no pattern. • Fiction: There is such a thing as "earthquake weather." Fact: There is no connection between earthquakes and weather. Remember, earthquakes happen deep in the earth, far away from the weather! • Fiction: Earthquakes are on the increase. Fact: It may seem like we’re having more ...
Specification for Buildings to be Built in Seismic Zones (2007
... with special system and equipment between foundation and soil for the purpose of isolating the building structural system from the earthquake motion, and to buildings incorporating other active and passive control systems. 1.1.7 – Requirements to be applied to structures which are outside the scope ...
... with special system and equipment between foundation and soil for the purpose of isolating the building structural system from the earthquake motion, and to buildings incorporating other active and passive control systems. 1.1.7 – Requirements to be applied to structures which are outside the scope ...
Earthquakes in Eastern Canada - Comptes
... cannot be predicted but ongoing studies help us predefine areas most likely to be strongly shaken during an earthquake. Previous experience has stressed several lessons useful for seismic hazard and seismic risk studies. Due to the efficiency of the Canadian Shield to transmit seismic waves, moderat ...
... cannot be predicted but ongoing studies help us predefine areas most likely to be strongly shaken during an earthquake. Previous experience has stressed several lessons useful for seismic hazard and seismic risk studies. Due to the efficiency of the Canadian Shield to transmit seismic waves, moderat ...
Script! - Canadian Academy
... “absorbed” from the absorbers helping support the building on a more balanced floor. Steel will help bend the building, which makes it move with the earthquake. There are many other rules or codes that help prevent this disaster from happening such as: damping, shear walls, movement-resistant frames ...
... “absorbed” from the absorbers helping support the building on a more balanced floor. Steel will help bend the building, which makes it move with the earthquake. There are many other rules or codes that help prevent this disaster from happening such as: damping, shear walls, movement-resistant frames ...
Stress Transfer Eart..
... (aftershocks are the best example of this). This is generally dependent on the conditions prior to the event (how close to failure was a certain area before the change in stress field) • Long term: can affect timing of subsequent events, bringing them either closer to failure, or farther from it • S ...
... (aftershocks are the best example of this). This is generally dependent on the conditions prior to the event (how close to failure was a certain area before the change in stress field) • Long term: can affect timing of subsequent events, bringing them either closer to failure, or farther from it • S ...
SSACgnp.QE1.JAM1.5 Core Quantitative Literacy
... 4. You calculated the rate of movement of the Pacific plate at 5.7 cm/year, but movement does not occur continuously. Many years, there is no movement at all. When movement does occur on the fault, displacement can be over 20 feet (in a matter of seconds). If the Pacific plate moved an average of 20 ...
... 4. You calculated the rate of movement of the Pacific plate at 5.7 cm/year, but movement does not occur continuously. Many years, there is no movement at all. When movement does occur on the fault, displacement can be over 20 feet (in a matter of seconds). If the Pacific plate moved an average of 20 ...
Seismic retrofit
Seismic retrofitting is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to earthquakes. With better understanding of seismic demand on structures and with our recent experiences with large earthquakes near urban centers, the need of seismic retrofitting is well acknowledged. Prior to the introduction of modern seismic codes in the late 1960s for developed countries (US, Japan etc.) and late 1970s for many other parts of the world (Turkey, China etc.), many structures were designed without adequate detailing and reinforcement for seismic protection. In view of the imminent problem, various research work has been carried out. State-of-the-art technical guidelines for seismic assessment, retrofit and rehabilitation have been published around the world - such as the ASCE-SEI 41 and the New Zealand Society for Earthquake Engineering (NZSEE)'s guidelines. These codes must be regularly updated; the 1994 Northridge earthquake brought to light the brittleness of welded steel frames, for example.The retrofit techniques outlined here are also applicable for other natural hazards such as tropical cyclones, tornadoes, and severe winds from thunderstorms. Whilst current practice of seismic retrofitting is predominantly concerned with structural improvements to reduce the seismic hazard of using the structures, it is similarly essential to reduce the hazards and losses from non-structural elements. It is also important to keep in mind that there is no such thing as an earthquake-proof structure, although seismic performance can be greatly enhanced through proper initial design or subsequent modifications.