Magnetotelluric imaging of the fault rupture area of the 1999 İzmit (Turkey) earthquake

2005 ◽  
Vol 150 (1-3) ◽  
pp. 213-225 ◽  
Author(s):  
S. Bülent Tank ◽  
Yoshimori Honkura ◽  
Yasuo Ogawa ◽  
Masaki Matsushima ◽  
Naoto Oshiman ◽  
...  
Keyword(s):  
Fault Rupture ◽  
Rupture Area ◽  
Magnetotelluric Imaging

Modeling of source rupture characteristics for the Saguenay earthquake of November 1988

1995 ◽  
Vol 85 (2) ◽  
pp. 525-551 ◽  
Author(s):  
R. A. W. Haddon
Keyword(s):  
North America ◽  
Stress Drop ◽  
High Stress ◽  
Strong Motion ◽  
Eastern North America ◽  
Fault Rupture ◽  
Rupture Area ◽  
Past Half Century ◽  
Acceleration Data ◽  
Strong Ground

Abstract The magnitude mb = 6.0 Saguenay earthquake of 25 November 1988 in Quebec, Canada, was one of the largest to have occurred in eastern North America during the past half-century. Recorded high-frequency ground motions exceeded anticipated values for an event of its size by a factor of 10 on both the regional network and strong-motion instruments. Two proposed explanations for the discrepancy are (1) that the source was a rare “high stress drop” event and (2) that it was an asymmetrical “fractional stress drop” rupture (involving only normal effective stresses). In this article, detailed fault-slip models are derived to fit characteristics of strong-motion displacement, velocity, and acceleration data. The results establish that the effective rupture stress was normal (less than 100 bars), that the fault rupture was highly asymmetrical with respect to the point of rupture initiation, and that the average slip time for points within the rupture area (approx. 0.2 sec) was considerably less than that associated with the standard Brune (1970) source spectral model. The rupture area developed in a number of episodes, each widening or lengthening the previously ruptured area, which may explain the short average slip time. The results indicate that the widely used assumption in hazard analyses that earthquake spectra are adequately represented by the standard Brune (1970) complete stress drop model may be seriously unreliable for prediction of strong ground motion in eastern North America.

Consistent Scaling Laws for Thrusting Environment

2018 ◽  
Vol 9 (2) ◽  
pp. 46-62
Author(s):  
Sunil Kumar ◽  
M.L. Sharma ◽  
Josodhir Das
Keyword(s):  
Present Article ◽  
Entire Range ◽  
Scaling Laws ◽  
Moment Magnitude ◽  
Fault Rupture ◽  
Empirical Relationships ◽  
Lower Range ◽  
Rupture Length ◽  
Rupture Area ◽  
Self Consistent

The main objective of the present article is to develop self-consistent empirical relationships between rupture parameters and moment magnitude for the Himalayas. The database includes the fault rupture parameters of significant earthquakes in the Himalayan region and thrusting earthquakes from NGA West-2 database. The existing empirical relationships between magnitude and rupture parameters are reviewed in view of their consistency. The consistent relationships between moment magnitude and rupture parameters are derived and compared with the existing such relationships. The comparison of the developed consistent relationships reveal that the rupture length was being underestimated in the range of magnitude from 7 to 8, whereas it was overestimated in the lower range of magnitudes using inconsistent empirical relationships. While rupture width was overestimated for the entire range of magnitudes using inconsistent relationships, the rupture area was underestimated for magnitude greater than 7.

Centrifuge and numerical modelling of tunnel intersected by normal fault rupture in sand

2019 ◽  
Vol 111 ◽  
pp. 137-146 ◽  
Author(s):  
Q.P. Cai ◽  
J.M. Peng ◽  
Charles. W.W. Ng ◽  
J.W. Shi ◽  
X.X. Chen
Keyword(s):  
Numerical Modelling ◽  
Normal Fault ◽  
Fault Rupture

Effect of boundary friction on revere fault rupture propagation in centrifuge tests

2021 ◽  
Vol 147 ◽  
pp. 106811
Author(s):  
Chaofan Yao ◽  
Jiro Takemura ◽  
Gaoyu Ma ◽  
Cong Dai ◽  
Zheli An
Keyword(s):  
Boundary Friction ◽  
Rupture Propagation ◽  
Fault Rupture ◽  
Centrifuge Tests ◽  
Fault Rupture Propagation
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