Oblique map of the north half of the Loma Prieta, California, earthquake rupture zone and environs

1989 ◽  
Author(s):  
Tau Rho Alpha ◽  
J.C. Lahr ◽  
Robert A. Page
Keyword(s):  
Rupture Zone ◽  
Earthquake Rupture ◽  
The North ◽  
Loma Prieta

Real-Time Tsunami Prediction System Using DONET

2017 ◽  
Vol 12 (4) ◽  
pp. 766-774 ◽  
Author(s):  
Narumi Takahashi ◽  
Kentaro Imai ◽  
Masanobu Ishibashi ◽  
Kentaro Sueki ◽  
Ryoko Obayashi ◽  
...  
Keyword(s):  
Real Time ◽  
Time Lag ◽  
Rupture Zone ◽  
Tsunami Source ◽  
Earthquake Rupture ◽  
Prediction System ◽  
Fault Models ◽  
Tsunami Height ◽  
Inundation Area ◽  
Selection Of

We constructed a real-time tsunami prediction system using the Dense Oceanfloor Network System for Earthquakes and Tsunamis (DONET). This system predicts the arrival time of a tsunami, the maximum tsunami height, and the inundation area around coastal target points by extracting the proper fault models from 1,506 models based on the principle of tsunami amplification. Since DONET2, installed in the Nankai earthquake rupture zone, was constructed in 2016, it has been used in addition to DONET1 installed in the Tonankai earthquake rupture zone; we revised the system using both DONET1 and DONET2 to improve the accuracy of tsunami prediction. We introduced a few methods to improve the prediction accuracy. One is the selection of proper fault models from the entire set of models considering the estimated direction of the hypocenter using seismic and tsunami data. Another is the dynamic selection of the proper DONET observatories: only DONET observatories located between the prediction point and tsunami source are used for prediction. Last is preparation for the linked occurrence of double tsunamis with a time-lag. We describe the real-time tsunami prediction system using DONET and its implementation for the Shikoku area.

scholarly journals A 3000-year record of surface-rupturing earthquakes at Günalan: variable fault-rupture lengths along the 1939 Erzincan earthquake-rupture segment of the North Anatolian Fault, Turkey

2013 ◽  
Vol 55 (5) ◽  
Author(s):  
Jeffrey George ◽  
Aurelia Hubert-Ferrari ◽  
Koen Verbeeck ◽  
David Garcia-Moreno ◽  
Ulas Avsar ◽  
...  
Keyword(s):  
North Anatolian Fault ◽  
Earthquake Rupture ◽  
Fault Rupture ◽  
The North

Structure of a fault segment boundary in the Lost River fault zone, Idaho, and possible effect on the 1983 Borah Peak earthquake rupture

1990 ◽  
Vol 80 (1) ◽  
pp. 57-68
Author(s):  
David D. Susong ◽  
Susanne U. Janecke ◽  
Ronald L. Bruhn
Keyword(s):  
Fault Zone ◽  
Three Dimensional ◽  
Longitudinal Axis ◽  
Geometrical Model ◽  
Geological Mapping ◽  
Earthquake Rupture ◽  
East Central ◽  
The North ◽  
Seismological Data ◽  
Projected Position

Abstract The 1983 Borah Peak earthquake (Ms 7.3) initiated within the southern part of the Thousand Springs segment in the Lost River fault zone, east-central Idaho. The earthquake rupture propagated unilaterally to the northwest over a distance of 36 km and was accompanied by sinistral-normal slip within the fault zone. At the surface, the southern-most part of the rupture zone is marked by a bend in the Lost River fault zone at the intersection between the Thousand Springs segment to the north and the Mackay segment of the fault zone to the southeast. The intersection between the two fault segments is a lens-shaped area that contains numerous NW- and NE-striking faults that cut the Paleozoic bedrock. Several of the faults within the intersection zone ruptured at the surface during the 1983 earthquake. A three-dimensional geometrical model of the intersection zone between the Thousand Springs and Mackay fault segments was constructed from geological mapping in conjunction with previously published interpretations of geodetic and seismological data. The longitudinal axis of the intersection zone plunges to the southwest, where its projected position in the subsurface roughly coincides with the location of the 1983 earthquake's hypocenter at a depth of 15 to 16 km. The intersection zone between the two fault segments may have played a dual role during the Borah Peak earthquake, both marking the site of rupture nucleation, but also acting to arrest spread of the rupture to the southeast onto the adjacent Mackay segment.

Rupture history of the 1989 Loma Prieta, California, earthquake

1991 ◽  
Vol 81 (5) ◽  
pp. 1573-1602 ◽  
Author(s):  
Jamison H. Steidl ◽  
Ralph J. Archuleta ◽  
Stephen H. Hartzell
Keyword(s):  
Fault Plane ◽  
Strong Motion ◽  
Strike Slip ◽  
Nonlinear Method ◽  
Loma Prieta Earthquake ◽  
Shear Wave Speed ◽  
The North ◽  
Time Histories ◽  
Slip Displacement ◽  
Loma Prieta

Abstract Strong motion records of the 1989 Loma Prieta earthquake are inverted to determine a model of the rupture history. Uncorrected horizontal and vertical accelerograms are integrated to particle velocity time histories for 38 stations within an epicentral range of 75 km. The time histories are bandpassed filtered with corners at 0.05 and 1.0 Hz. These bandpassed time histories are inverted using a nonlinear method to solve for the distribution of slip amplitudes and rupture times at specified locations on the fault plane. The fault plane is specified a priori: 38 km long and 17 km wide, extending from 3 to 19 km depth at a constant dip of 70°. Starting models have rupture times based on constant rupture velocities of 2.5, 2.8, and 3.0 km/sec and uniform slip with rise times of 0.5, 1.0, 1.5, and 3.0 sec. The waveform inversion results show the strike-slip displacement is concentrated at the southern end of the rupture (rake = 156°) and the dip-slip displacement is concentrated at the northern end of the rupture (rake = 115°). The average total slip is partitioned almost equally between strike slip and dip slip (rake = 137°). The hypocentral area has an unusually small amount of slip with almost no slip in a region just to the north and up dip from the hypocenter. The rupture front is complex, propagating up dip to the south faster than it propagates to the north. The region of maximum strike slip to the southeast radiates simultaneously with the region of maximum dip slip to the northwest. The average rupture velocity is 3.0 km/sec, approximately 0.83 times the local shear wave speed. The calculated seismic moment is 3.5 ± 0.5 × 1026 dyne-cm.

scholarly journals Detailed seismic imaging of the Mw 7.1 Ridgecrest earthquake rupture zone from data recorded by dense linear arrays

2020 ◽  
Author(s):  
Hongrui Qiu ◽  
Yehuda Ben-Zion ◽  
R. D. Catchings ◽  
Mark R Goldman ◽  
Amir Allam ◽  
...  
Keyword(s):  
Seismic Imaging ◽  
Rupture Zone ◽  
Earthquake Rupture ◽  
Linear Arrays

scholarly journals Seafloor changes above the Tohoku-Oki earthquake rupture zone

Eos ◽  
2014 ◽  
Vol 95 (50) ◽  
pp. 484-484
Author(s):  
Jessica Orwig
Keyword(s):  
Rupture Zone ◽  
Earthquake Rupture
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