A tale of two earthquakes; Parkfield, CA; November 14, 1993 and December 20, 1994Hellweg, MargaretBoatwright, JFletcher, J BDietel, C M
We determined source parameters of repeating microearthquakes occurring at Parkfield, CA, using the SAFOD Pilot Hole seismic array. To estimate reliable source parameters, we used the empirical Green's function (EGF) deconvolution method which removes the attenuation effects and site responses by taking...
26 km SSW of Newport Beach, CA 2.3 829 miles Mon, Feb-10-2025 20:55:01 PST map 23 km SW of Susitna, Alaska 2.8 1737 miles Mon, Feb-10-2025 18:06:30 PST map 18 km NNW of Parkfield, CA 2.0 671 miles Mon, Feb-10-2025 17:35:47 PST map 170 km W of Ferndale, California 2....
An example ofarepeating earthquake source locations,bcumulative slip, andcwaveforms for one sequence 65 km deep in the northeastern Japan subduction zone (see inset inafor the location) (after Uchida et al. (2006)). The centroid locations are based on double-difference hypocenter estimation usi...
The spatio-temporal heterogeneity of stress and strength has been investigated by stress drops of earthquakes, especially over the last several years. Allmann and Shearer (2007) analyzed stress drops of small earthquakes near Parkfield, California, and investigated the relationships between their spatial...
L. Ellsworth (2006), Source scaling relationships of microearthquakes at Parkfield, CA, determined using the SAFOD pilot hole seismic array, Geophys. Monogr., 170, 81–90. Kagan, Y. Y. (1991), 3-D rotation of double-couple earthquake sources, Geophys. J. Int., 106, 709–716, doi:...
Waldhauser F, Ellsworth WL, Cole A (1999) Slip-parallel seismic lineations on the Hayward fault and the San Andreas fault near Parkfield, California. Geophys Res Lett 70:246 Google Scholar Wang J, Teng T (1997) Identification and picking of S phase using an artificial neural network. Bull ...
Given these findings, we argue that amplitude contributes, but alone does not appear to be a sufficient criterion to trigger tremor except in cases of the two very largest deformations. This differs from the triggered tremor in Parkfield, California, which appears at the time of the strongest ...
(ground-motion predictive models, site effect estimates, etc.) as described in Cauzzi et al. (2014). In the case of the ML3.2 Diemtigen event, the felt reports suggest higher intensity levels than the instrumental ShakeMap close to the epicenter and in the urban areas of Bern and ...
global earthquake activity and global earthquake maps. USGS also has an "Earthquake Information from USGS" page primarily dealing with Northern California, but also data on the Parkfield study and a general discussion on the use of foreshocks to estimate the odds of larger events in the future....