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Seismic attenuation
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Vietnam is located in a strong earthquake zone with many areas having a ground acceleration (ag) of greater than 0.08 g (TCVN 9386:2012). The article introduces a method to determine the attenuation coefficients according to the standard TCVN 10304:2014.
9p
viwalton
02-07-2024
1
1
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The average QES value is consistent with the previous results obtained in some back-arc regions such as Japan Sea and may suggest a similar termination age of spreading process. However, since the distribution of 90 ray paths can be roughly classified into two directions, northeast-southwest (NE-SW) and northwest-southeast (NW-SE), the average Q values of these two directions are derived to be QNE-SW = 455±109 and QNW-SE = 133±50, respectively.
4p
viwendy2711
05-10-2021
13
1
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Empirical magnitude conversion relationships are one of the important parameters for not only seismological studies but also seismic hazard analysis and development of the attenuation relationships. Particularly, for seismic hazard analysis, conversion of various types of magnitudes to moment magnitude, which is the most reliable and common magnitude scale, is a key requirement.
11p
viminotaur2711
30-10-2019
11
1
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The data from a local network of 21 and 19 acceleration recordsfor the first and second main shocks have been used to estimate Q-relationship in 30 stations. The seismic hazard map for this region illustrates that most of the area in this province is located within high relative risk and characterized by a large number of heterogeneities.
15p
meriday
26-04-2019
22
1
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In this paper, the probabilistic seismic hazard maps for the South Central Vietnam are presented. An earthquakes catalog updated until 2014 and most recent seismotectonic and geodynamic information were used for delineation of 14seismic source zones in the study area. The Toro et al. (1997) attenuation equation was used for the PSHA. The hazard maps show distribution of the mean peak ground acceleration (PGA) with a 10%, 5%, 2% and 0.5% probability of exceedance in 50 years.
0p
meolep4
02-01-2019
22
1
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North-East India is located in one of the most seismic prone areas of the world. India has faced several devastating earthquakes in the past. The largest of these have originated in the Himalayan plate boundary region, which has remained a region of great scientific and engineering interest. In spite of this, very little seismological information is available about North- East India, which is the focus for present study.
11p
meolep1
28-11-2018
13
1
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Asthenosphere A region of the earth’s upper mantle at a depth of approximately 75–150 km, characterized by low mechanical strength, attenuation of seismic shear waves, and partial melting. The term was coined in the 1910s by geologist Joseph Barrell to describe the zone in which isostatic adjustment occurs and basaltic magmas are generated. With the development of plate tectonics in the 1960s, the asthenosphere is now un- derstood as the plastic zone over which the rigid plates move....
265p
banhkem0908
24-11-2012
55
6
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Geotechnical Earthquake Considerations 33.1. Introduction 33.2. Seismology 33.3. Measurement of Earthquakes Magnitude • Intensity • Time History • Elastic Response Spectra • Inelastic Response Spectra 33 33.4. Strong Motion Attenuation and Duration 33.5 Probabilistic Seismic Hazard Analysis 33.6 Site Response Basic Concepts • Evidence for Local Site Effects • Methods of Analysis • Site Effects for Different Soil Conditions 33.7 Earthquake-Induced Settlement Settlement of Dry Sands • Settlement of Saturated Sands 33.
44p
naunho
27-12-2010
92
11
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