Calibrating Spectral Decomposition of Local Earthquakes Using Borehole Seismic Records—Results for the 1992 Big Bear Aftershocks in Southern California

2021 ◽  
Vol 126 (3) ◽  
Author(s):  
Peter M. Shearer ◽  
Rachel E. Abercrombie
Keyword(s):  
Spectral Decomposition ◽  
Southern California ◽  
Local Earthquakes ◽  
Seismic Records ◽  
Borehole Seismic

scholarly journals More Than a Million New Earthquakes Spotted in Archival Data

Eos ◽  
2019 ◽  
Vol 100 ◽  
Author(s):  
Katherine Kornei
Keyword(s):  
Southern California ◽  
Archival Data ◽  
Seismic Records ◽  
Fault Structures

By reanalyzing seismic records, researchers found a plethora of tiny earthquakes in Southern California that trace new fault structures and reveal how earthquakes are triggered.

scholarly journals A second study of blasting recorded in Southern California

1933 ◽  
Vol 23 (3) ◽  
pp. 95-110 ◽  
Author(s):  
Harry O. Wood ◽  
Charles F. Richter
Keyword(s):  
Southern California ◽  
The Body ◽  
Satisfactory Explanation ◽  
Reflected Waves ◽  
Precise Method ◽  
Positive Evidence ◽  
Local Earthquakes

Summary Investigation of several blasts subsequent to those considered in our previous study, and in particular a major blast set off near Victorville, California, on September 12, 1931, has yielded results as follows. 1. In two cases the time of detonation was determined (a) very accurately in the case of the blast near Victorville by a precise method, and (b) probably with substantially equal accuracy in the case of the blast in the Arroyo Seco, though the method employed was inherently less precise. 2. Phases, or definite changes in registered motion, have been recognized and measured which appear to correspond to successive arrivals of waves traveling, apparently, along direct paths with different apparent velocities, as follows: 6.0− 5.9+, 5.55, 5.4−, 5.0+, 4.1, 3.5−, 3.4−, 3.25, 3.15, 3.0−, 2.7± kilometers per second. 3. In the present study no positive evidence has been found to indicate reflected waves, or waves refracted along deeper layers. Phases considered in the previous study to indicate such waves are now found to be susceptible of alternative explanations. Difficulties have been encountered, as discussed in the body of the paper, in the interpretation and satisfactory explanation of certain of the very numerous apparent phases, particularly those which appear to indicate waves with apparent velocities of 6.0− to 5.9+, and 4.1 kilometers per second. From this it is again clear that further opportunities for similar investigations are of great importance. For this reason, and also in order that blasts of moderate, or larger, magnitude may not be included in lists of small local earthquakes, it is suggested that all such blasts set off in the region of Southern California should be reported to the Seismological Laboratory at Pasadena—and, whenever practicable, sufficiently in advance to permit preparations for thorough study.

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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