scholarly journals The Role of Water in Earth's Tectonic Plumbing Systems

Eos ◽  
2016 ◽  
Vol 97 ◽  
Author(s):  
Kate Wheeling
Keyword(s):  
San Andreas Fault ◽  
Fault Zones ◽  
Well Water ◽  
Tidal Forces ◽  
San Andreas ◽  
Plumbing Systems ◽  
Hydrogeological Structure

Tidal forces act on well water around the San Andreas Fault, giving researchers a new window into the hydrogeological structure of fault zones.

DETAIL GRAVITY PROFILE ACROSS SAN ANDREAS FAULT ZONE

Geophysics ◽  
1967 ◽  
Vol 32 (2) ◽  
pp. 297-301 ◽  
Author(s):  
S. N. Domenico
Keyword(s):  
Fault Zone ◽  
Mojave Desert ◽  
San Andreas Fault ◽  
Surface Expression ◽  
Fault Zones ◽  
Rock Masses ◽  
San Andreas ◽  
Major Fault ◽  
Reduced Density ◽  
Gravity Profile

A gravity profile was obtained from closely spaced readings along a traverse approximately nine miles in length across the San Andreas fault zone immediately south of Palmdale, California in the western Mojave Desert. Corrected gravity values show a slight but distinctive minimum associated with the fault zone which may be attributed to the reduced density of the shattered rock masses in the fault zone. The existence of this minimum suggests that major fault zones may be traced across terrain, on which surface expression of the fault does not exist, by successive profiles across the suspected position of the fault zone.

scholarly journals Fractal properties and simulation of micro-seismicity for seismic hazard analysis: a comparison of North Anatolian and San Andreas Fault Zones

2012 ◽  
Vol 2 (1) ◽  
pp. 1 ◽  
Author(s):  
Naside Ozer ◽  
Savas Ceylan
Keyword(s):  
Fractal Dimension ◽  
Seismic Hazard ◽  
Fault Zone ◽  
San Andreas Fault ◽  
Fractal Dimensions ◽  
Fault Zones ◽  
Group Method ◽  
Western Anatolia ◽  
P Value ◽  
San Andreas

We analyzed statistical properties of earthquakes in western Anatolia as well as the North Anatolian Fault Zone (NAFZ) in terms of spatio-temporal variations of fractal dimensions, p- and b-values. During statistically homogeneous periods characterized by closer fractal dimension values, we propose that occurrence of relatively larger shocks (M >= 5.0) is unlikely. Decreases in seismic activity in such intervals result in spatial b-value distributions that are primarily stable. Fractal dimensions decrease with time in proportion to increasing seismicity. Conversely, no spatiotemporal patterns were observed for p-value changes. In order to evaluate failure probabilities and simulate earthquake occurrence in the western NAFZ, we applied a modified version of the renormalization group method. Assuming an increase in small earthquakes is indicative of larger shocks, we apply the mentioned model to micro-seismic (M<= 3.0) activity, and test our results using San Andreas Fault Zone (SAFZ) data. We propose that fractal dimension is a direct indicator of material heterogeneity and strength. Results from a model suggest simulated and observed earthquake occurrences are coherent, and may be used for seismic hazard estimation on creeping strike-slip fault zones.

Mantle strength of the San Andreas fault system and the role of mantle-crust feedbacks

Geology ◽  
2015 ◽  
Vol 43 (10) ◽  
pp. 891-894 ◽  
Author(s):  
Vasileios Chatzaras ◽  
Basil Tikoff ◽  
Julie Newman ◽  
Anthony C. Withers ◽  
Martyn R. Drury
Keyword(s):  
San Andreas Fault ◽  
Fault System ◽  
San Andreas ◽  
San Andreas Fault System

A Discussion on the measurement and interpretation of changes of strain in the Earth - Role of pore fluids in faulting

1973 ◽  
Vol 274 (1239) ◽  
pp. 297-304 ◽  
Keyword(s):  
Pore Pressure ◽  
San Andreas Fault ◽  
Fault Creep ◽  
Time Constants ◽  
San Andreas ◽  
The Earth ◽  
Shallow Earthquakes ◽  
Pressure Changes

We consider three in situ processes which involve fluid flow in the crust: fault creep, aftershocks and dilatancy. Measurements of water level in wells suggest that creep events on the San Andreas fault are coupled with pore pressure changes. Readjustment of transient pore pressure, induced by large shallow earthquakes, possess the correct time constants and magnitudes to explain the occurrence of aftershocks. And finally, temporal changes of travel times in the Gram district (U.S.S.R.) imply that dilatancy may occur in situ.

scholarly journals The Evergreen basin and the role of the Silver Creek fault in the San Andreas fault system, San Francisco Bay region, California

Geosphere ◽  
2017 ◽  
Vol 13 (2) ◽  
pp. 269-286
Author(s):  
R.C. Jachens ◽  
C.M. Wentworth ◽  
R.W. Graymer ◽  
R.A. Williams ◽  
D.A. Ponce ◽  
...  
Keyword(s):  
San Francisco ◽  
San Andreas Fault ◽  
San Francisco Bay ◽  
Fault System ◽  
San Andreas ◽  
San Andreas Fault System
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