Joint resolving of the fault plane ambiguity and anisotropic earthquake triggering in Southern California

2021 ◽  
Author(s):  
Leila Mizrahi ◽  
Shyam Nandan ◽  
Stefan Wiemer
Keyword(s):  
Southern California ◽  
Fault Plane ◽  
Earthquake Triggering

Combined modeling and smooth inversion of gravity data from a faulted basement relief

Geophysics ◽  
2014 ◽  
Vol 79 (6) ◽  
pp. F1-F10 ◽  
Author(s):  
Williams A. Lima ◽  
João B. C. Silva
Keyword(s):  
Southern California ◽  
Fault Plane ◽  
Sedimentary Basin ◽  
Gravity Data ◽  
Fault Slip ◽  
Gravity Inversion ◽  
True Source ◽  
Global Smoothness

We have combined modeling and gravity inversion to estimate an overall smooth but locally discontinuous basement relief of a sedimentary basin. Through an initial global smoothness solution, the method indicates fault positions that may be accepted or modified. Then, the interpreter specifies the fault dip and a tentative fault slip, so the fault plane is fixed on the estimated relief. The segments of the current interpreted relief that are not accepted faults are estimated through smoothness inversion, and the response of the current estimated relief is computed. The slip of the fault being incorporated in the estimated relief is then modified interactively until the solution presents no side lobes about the fault extremes. The process is repeated for all faults. The iteration stops when the tentative solution becomes compatible with the geologic knowledge of the area and produces an acceptable data fit. The method was applied to data produced by a simulated graben defined by step faults dipping 60º and by inclined and arcuate terraces. The solution virtually coincided with the true source. The method’s ability in testing geologic hypotheses was demonstrated in gravity profiles across the Büyük Menderes Valley in west Turkey and the San Jacinto graben in southern California.

Searching for hidden earthquakes in Southern California

Science ◽  
2019 ◽  
Vol 364 (6442) ◽  
pp. 767-771 ◽  
Author(s):  
Zachary E. Ross ◽  
Daniel T. Trugman ◽  
Egill Hauksson ◽  
Peter M. Shearer
Keyword(s):  
Power Law ◽  
Template Matching ◽  
Southern California ◽  
Fold Increase ◽  
Fault Zones ◽  
Detection Technique ◽  
Earthquake Triggering ◽  
Triggering Mechanisms ◽  
The Rich ◽  
Size Relation

Earthquakes follow a well-known power-law size relation, with smaller events occurring much more often than larger events. Earthquake catalogs are thus dominated by small earthquakes yet are still missing a much larger number of even smaller events because of signal fidelity issues. To overcome these limitations, we applied a template-matching detection technique to the entire waveform archive of the regional seismic network in Southern California. This effort resulted in a catalog with 1.81 million earthquakes, a 10-fold increase, which provides important insights into the geometry of fault zones at depth, foreshock behavior and nucleation processes, and earthquake-triggering mechanisms. The rich detail resolved in this type of catalog will facilitate the next generation of analyses of earthquakes and faults.

The Effects of Presentation on Noise and Dental Appliances on Speech

1981 ◽  
Vol 24 (1) ◽  
pp. 151-151
Author(s):  
Lillian Glass ◽  
Sharon R. Garber ◽  
T. Michael Speidel ◽  
Gerald M. Siegel ◽  
Edward Miller
Keyword(s):  
Southern California ◽  
University Of Southern California ◽  
University Of Minnesota ◽  
School Of Medicine ◽  
Southern California School ◽  
School Of Dentistry ◽  
The University

An omission in the Table of Contents, December JSHR, has occurred. Lillian Glass, Ph.D., at the University of Southern California School of Medicine and School of Dentistry, was a co-author of the article "The Effects of Presentation on Noise and Dental Appliances on Speech" along with Sharon R. Garber, T. Michael Speidel, Gerald M. Siegel, and Edward Miller of the University of Minnesota, Minneapolis.

Patiens of infectious diarrhea peaks in Southern California

2001 ◽  
Vol 120 (5) ◽  
pp. A215-A216
Author(s):  
C CONTEAS ◽  
J PRUTHI ◽  
R BURCHETTE
Keyword(s):  
Southern California ◽  
Infectious Diarrhea
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