Estimation of causative fault parameters of the Rudbar earthquake of June 20, 1990 from near field SH-wave data

Sarkar, Irene; Hamzehloo, H.; Khattri, K. N.

doi:10.1016/s0040-1951(03)00050-7

Cited by 17 publications

(9 citation statements)

References 9 publications

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“…In this study we analyze the accelerograms to model the earthquake source in terms of BRUNES (1970) model and obtain a double-couple fault plane solution using SH waves, as approximated by the transverse component accelerograms. SARKAR et al (2003, 1370 D. Kumar et al Pure appl. geophys., 2005) have used this procedure successfully to investigate the strong motion data of the Rudbar and Tabas (Iran) earthquakes.…”

Section: Introductionmentioning

confidence: 99%

A Study of Source Parameters, Site Amplification Functions and Average Effective Shear Wave Quality Factor Qseff from Analysis of Accelerograms of the 1999 Chamoli Earthquake, Himalaya

Kumar

Ram

Khattri³

2006

Pure appl. geophys.

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The accelerograms of the 1999 Chamoli earthquake and nine of its aftershocks, which occurred in Uttaranchal Himalaya, have been analyzed to investigate their source parameters, the site amplification functions and the average effective shear-wave quality factor Q seff in the region. The fault plane solution of the main shock is obtained using the spectral amplitudes of SH waves (approximated by transverse components of accelerograms) of the high-energy packets observed in the accelerograms of the main shock. It is found to be comparable with the reported solutions in other studies. Similarly the other source parameters (viz., seismic moment = (5.03±1.7) · 10 25 dyne-cm, stress drop = 65 bars, source duration = 5.2 s and moment magnitude = 6.4) estimated for the main shock are consistent with the values obtained in other studies. The stress drops estimated for the aftershocks vary from 23 bars to 153 bars and the seismic moment from 1.4 · 10 23 dyne-cm to 2.9 · 10 23 dyne-cm. The average estimated values of the effective shear-wave quality factor Q seff vary from 655±359 in the Uttaranchal sector of Himalaya and 1475±130 in the Delhi region. In general, the Q seff value increases with an increase in the epicentral distance reflecting the penetration of the waves into deeper layers of the crust as the epicentral distance of the observation point increases. These values of Q seff indicate that in general the curst is at low temperatures that will promote brittle behavior and conditions for episodic failure as compared to creep, under the accumulated strains from plate collision at the Himalaya plate boundary. The site amplification characteristics at sites have been identified from the frequency bands of significant amplification observed in the spectral ratios of the horizontal to the vertical component records. The decay of peak ground acceleration (PGA) values with distance has been investigated using the empirical regression curves vis-a`-vis the site amplification factors.

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Section: Introductionmentioning

confidence: 99%

A Study of Source Parameters, Site Amplification Functions and Average Effective Shear Wave Quality Factor Qseff from Analysis of Accelerograms of the 1999 Chamoli Earthquake, Himalaya

Kumar

Ram

Khattri³

2006

Pure appl. geophys.

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“…The site amplification factors employed here are those of Boore and Joyner 19) for various sites which are characterized by the average shear wave velocity. There is no recorded earthquake with a big magnitude on the North Tehran Fault; so here we show acceleration time history of Rudbar earthquake of 1990/06/20 with Mw=7.3 (Berberian and Walker 20) , Sarkar et al 21) ) beside time histories of our simulations in Figure 5. This earthquake was chosen because it was one of the devastating earthquakes that occurred in the last decades in Iran and its accelerogram is available.…”

Section: Analysis and Resultsmentioning

confidence: 84%

“…These segments are arranged in rightstepping en-echolon pattern and are separated by gaps in the observed surface rupture. Three main subevents that can be seen in seismic body waves are correspond to these three main segments of surface rupture 20), 21) . We should point out here that the difference of the PGAs for different cases is mostly because of the stochastic process of generating the wave.…”

Section: Analysis and Resultsmentioning

confidence: 99%

Finite Fault Modeling of Future Large Earthquake From North Tehran Fault in Karaj, Iran

Samaei

Miyajima

Saffari

et al. 2012

J. JSCE

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The main purpose of this study is to predict strong ground motions from future large earthquake for Karaj city, the capital of Alborz province of Iran. This city is an industrialized city having over one million populations and is located near several active faults. Finite fault modeling with a dynamic corner frequency has adopted here for simulation of future large earthquake. Target fault is North Tehran fault with the length of 110 km and rupture of west part of the fault which is closest to Karaj, assumed for this simulation. For seven rupture starting points, acceleration time series in the site of Karaj Caravansary -historical building-are predicted. Peak ground accelerations for those are vary from 423 cm/s 2 to 584 cm/s 2 which is in the range of 1990 Rudbar earthquake (M w =7.3) . Results of acceleration simulations in different distances are also compared with attenuation relations for two types of soil. Our simulations show general agreement with one of the most well known world attenuation relations and also with one of the newest attenuation relation that hase developed for Iranian plateau.

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“…The aim of this study is to infer the causative fault plane parameters using strong ground motion data, and show how these data can help us to identify the fault plane in the focal mechanism solution, especially when lack of information such as surface rupture, aftershocks data, and an isoseismal map make it difficult to identify the fault plane in focal mechanisms reported by far field data. Recently, Sarkar et al (2003) have analyzed the strong ground motion of the 1990 Rudbar earthquake to infer the characteristics of the source. SH-wave (horizontal shear wave) analyses of accelerograms exhibit distinct phases corresponding to energy released from three separate asperities on the discontinuous segments.…”

Section: Methodsmentioning

confidence: 99%

Determination of causative fault parameters for some recent Iranian earthquakes using near field SH-wave data

Hamzehloo

2005

Journal of Asian Earth Sciences

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Estimation of causative fault parameters of the Rudbar earthquake of June 20, 1990 from near field SH-wave data

Cited by 17 publications

References 9 publications

A Study of Source Parameters, Site Amplification Functions and Average Effective Shear Wave Quality Factor Qseff from Analysis of Accelerograms of the 1999 Chamoli Earthquake, Himalaya

A Study of Source Parameters, Site Amplification Functions and Average Effective Shear Wave Quality Factor Qseff from Analysis of Accelerograms of the 1999 Chamoli Earthquake, Himalaya

Finite Fault Modeling of Future Large Earthquake From North Tehran Fault in Karaj, Iran

Determination of causative fault parameters for some recent Iranian earthquakes using near field SH-wave data

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