Borehole observations of continuous strain and fluid pressure
31
Citation
0
Reference
10
Related Paper
Citation Trend
Keywords:
Strain (injury)
El Mayor-Cucapah earthquake Mw 7.2 on April 4, 2010, occurred on Mexicali Valley near the international border between California, USA and Baja California, Mexico. The objective of this paper was to examine GPS as a complementary tool for seismic studies and to estimate earthquake seismic moment and Mw. For this purpose the capabilities of high-rate GPS (5 Hz) data located in the northern part of the seismic rupture has been explored to obtain the kinematic coseismic displacements. GPS data were processed using Precise Point Positioning method with GIPSY-OASIS II software, then applying the Fast Fourier Transform to the position time series, spectral parameters, seismic moment and Mw were calculated. A good agreement was found in terms of signal correlation of the GPS displacements, by comparing strong-motion seismic records integrated to displacement, using filtering parameters for two sets of instruments. Kinematic GPS displacement spectra clearly shows the low frequency displacement spectral level (~0.2 Hz) when compared with double integration of strong-motion data. It is easy to calculate the static coseismic motion from GPS data, however it is very difficult to calculate it from strong-motion data. A simple earthquake source model is suitable for the GPS dataset used in this work, estimated on Mw=7.19±0.13, was in according with Mw 7.2 obtained in other studies of the El Mayor-Cucapah earthquake.
Seismic moment
Precise Point Positioning
Moment magnitude scale
Cite
Citations (2)
From a geodetic point of view, the detection of areas within the Earth's crust that are strongly deformed can be seen as the first step in locating zones needing more precise study. In such studies, the datum problem of estimated velocities plays a key role in the geodynamical interpretation of results. In this paper, we will briefly present the advantages of an analytical surface deformation theory to describe movements of the Earth's crust and discuss the results of the deformation analysis based on the GPS (Global Positioning System) campaigns carried out in the area of the Adriatic Sea.
Satellite geodesy
Earth crust
geodynamics
Cite
Citations (18)
The 3 November 2002 moment magnitude 7.9 Denali fault earthquake generated large, permanent surface displacements in Alaska and large-amplitude surface waves throughout western North America. We find good agreement between strong ground-motion records integrated to displacement and 1-hertz Global Positioning System (GPS) position estimates collected approximately 140 kilometers from the earthquake epicenter. One-hertz GPS receivers also detected seismic surface waves 750 to 3800 kilometers from the epicenter, whereas these waves saturated many of the seismic instruments in the same region. High-frequency GPS increases the dynamic range and frequency bandwidth of ground-motion observations, providing another tool for studying earthquake processes.
Epicenter
Seismic moment
Hertz
Moment magnitude scale
Strong ground motion
Cite
Citations (321)
Vertical displacement
Horizontal and vertical
Cite
Citations (1)