Measurements of the strain field associated with episodic creep events on the San Andreas Fault at San Juan Bautista, California

1994 ◽  
Vol 99 (B3) ◽  
pp. 4559-4565 ◽  
Author(s):  
M. T. Gladwin ◽  
R. L. Gwyther ◽  
R. H. G. Hart ◽  
K. S. Breckenridge
Keyword(s):  
Strain Field ◽  
San Andreas Fault ◽  
San Juan ◽  
San Andreas ◽  
San Juan Bautista

Seismic moments, local magnitudes, and coda-duration magnitudes for earthquakes in central California

1984 ◽  
Vol 74 (2) ◽  
pp. 439-458 ◽  
Author(s):  
William H. Bakun
Keyword(s):  
Seismic Moment ◽  
San Andreas Fault ◽  
Seismic Network ◽  
San Juan ◽  
Local Magnitude ◽  
Central California ◽  
San Andreas ◽  
Duration Magnitude ◽  
San Juan Bautista ◽  
The U.S

Abstract Onscale seismograms recorded at stations in the U.S. Geological Survey's (USGS) central California seismic network (CALNET) have been used to estimate the seismic moment M0 and local magnitude ML for earthquakes of 1 ≦ ML ≦ 4 located on the San Juan Bautista and Parkfield sections of the San Andreas fault, the Coyote Lake section of the Calaveras fault, the Sargent fault, and near Livermore. These data, together with M0 and ML estimates for 4 ≦ ML ≦ 6 earthquakes in these areas, cannot be fit with a single linear log M0-versus-ML relation. Rather, the data are consistent with log M0 = 1.5 ML + 16 for 3 ≲ ML ≲ 6, with log M0 = 1.2 ML + 17 for 1 1/2 ≲ ML ≲ 3 1/2 and with a slope of ⅔ to 1 fro 1/2 ≲ ML ≲ 1 1/2. Whereas USGS coda duration magnitude MD is consistent with ML for 1 1/2 ≲ ML ≲ 3¼, MD is larger than ML at ML ≲ 1 1/2 and smaller than ML at ML ≳ 3¼. Log M0 can be estimated to a precision of 0.2 for 1 ≦ MD ≦ 3 1/2 earthquakes in central California by applying log M0 = 1.2 MD + 17 to the MD that have been routinely published by the USGS.

scholarly journals Variability of fault slip behavior along the San Andreas Fault in the San Juan Bautista Region

2014 ◽  
Vol 119 (12) ◽  
pp. 8827-8844 ◽  
Author(s):  
Taka'aki Taira ◽  
Roland Bürgmann ◽  
Robert M. Nadeau ◽  
Douglas S. Dreger
Keyword(s):  
San Andreas Fault ◽  
Fault Slip ◽  
San Juan ◽  
San Andreas ◽  
San Juan Bautista

Short-range distance measurements along the San Andreas fault system in central California, 1975 to 1979

1981 ◽  
Vol 71 (5) ◽  
pp. 1607-1624
Author(s):  
M. Lisowski ◽  
W. H. Prescott
Keyword(s):  
San Andreas Fault ◽  
Slip Rate ◽  
San Juan ◽  
Distance Measurements ◽  
Slip Rates ◽  
Central California ◽  
San Andreas ◽  
Fault Slip Rates ◽  
San Juan Bautista ◽  
Wide Zone

abstract Periodic measurements of fault-crossing networks with a side length of 1 to 3 km are being made to monitor deformation across fault zones in California. The distance measurements are made with a Hewlett-Packard 3800 or 3808 electronic distance meter and have a maximum standard deviation of 5 mm. Deformation measured within networks that span the San Juan Bautista-Cholame segment of the San Andreas fault in central California yields slip rates similar to those measured across a 100- to 300-m-wide zone by repeated alinement array surveys. Fault slip rates increase from near 0 to 32 mm/yr between San Juan Bautista and Bitterwater Valley in step-like increments. From Bitterwater to Slack Canyon slip rates vary between 26 and 32 mm/yr. Slip rates decrease southwestward of Slack Canyon to 3 mm/yr at Cholame. In contrast, Geodolite measurements of deformation across a 20-km-wide zone are consistent from San Juan Bautista to Slack Canyon and imply a 32 ± 2 mm/yr slip rate. Deformation across the Calaveras fault accounts for the difference between Geodolite and near-fault slip rates between San Juan Bautista and Bear Valley, although the zone of deformation is wider than 2.5 km just south of Hollister. At Bear Valley, measurements of a short-range network crossing the Paicines fault imply a slip rate of 10 ± 3 mm/yr during the period 1976 to 1979. From Slack Canyon to Cholame, Geodolite measurements show a constant decrease in the rate of shallow slip.

Long-period ground motions and dynamic strain field of Los Angeles basin during large earthquakes

1996 ◽  
Vol 86 (5) ◽  
pp. 1417-1433
Author(s):  
T. L. Teng ◽  
J. Qu
Keyword(s):  
Los Angeles ◽  
Displacement Field ◽  
Seismic Moment ◽  
Strain Field ◽  
San Andreas Fault ◽  
Ground Motions ◽  
Dynamic Strain ◽  
Los Angeles Basin ◽  
Long Period ◽  
San Andreas

Abstract During a big earthquake along the San Andreas fault in southern California, high excitation and low attenuation of long-period (3 to 10 sec) strong ground motions will cause wave motions to propagate efficiently far from the epicentral area. These ground motions could potentially be destructive to large-dimension structures in the Los Angeles basin. We performed calculations using the surface-wave Gaussian beam method for a 3D southern California crustal structure. Displacement field as well as the associated dynamic strain field produced by large propagating ruptures along the San Andreas fault are evaluated. Results indicate that in the presence of lateral heterogeneity, focusing and multipathing interference contribute significantly to a complex pattern of the displacement field and the associated dynamic strain field. For a big event on the San Andreas fault with a seismic moment of 1.8 × 1028 dyne-cm, long-period displacement in the Los Angeles basin could reach a maximum amplitude of meters in places. Since this calculation is fast, we have evaluated the displacement field for a dense grid of points; a differentiation gives the corresponding effective horizontal dynamic strain field. At times, the maximum effective dynamic strains may reach mid-10−3 to even 10−3—high enough to be of engineering concern. This computational result probably gives the upper bound values due to the large source assumed. For events of smaller seismic moment release along less extensive ruptures, these results can easily be scaled down proportionally. Different scenarios are considered in this study with different slip distributions. It is found that with a given seismic moment, a more evenly distributed fault slip over the rupture surface will result in lower peak values on both displacements and dynamic strains. Our displacement results give similar values to those obtained by Kanamori using empirical Green's functions but substantially higher than Bouchon and Aki's results.

LOS PRIMEROS AIRES DE LIBERTAD: EL CONVENTO DE SAN JUAN BAUTISTA DE LA ORDEN DE LOS CAPUCHINOS EN LA VILLA DEL SOCORRO, ESPACIO VITAL EN LA INDEPENDENCIA DE LA NUEVA GRANADA (1781-1819)

Revista M ◽  
2011 ◽  
Vol 8 (1) ◽  
pp. 4
Author(s):  
María Fernanda Reyes Rodríguez ◽  
Jennifer Álvarez Quintero ◽  
Geisson Mauricio Delgado López ◽  
Wendy Yurany Henao Pineda ◽  
Linda Stephanie Rincón Sánchez
Keyword(s):  
San Juan ◽  
San Juan Bautista ◽  
Nueva Granada
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