Detection of crustal deformation from the Landers earthquake sequence using continuous geodetic measurements
Nature
By: Y. Bock, D.C. Agnew, P. Fang, J.F. Genrich, B.H. Hager, T.A. Herring, K.W. Hudnut, R.W. King, S. Larsen, J.-B. Minster, K. Stark, S. Wdowinski, and F.K. Wyatt
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Abstract
The measurement of crustal motions in technically active regions is being performed increasingly by the satellite-based Global Positioning System (GPS)1,2, which offers considerable advantages over conventional geodetic techniques3,4. Continuously operating GPS arrays with ground-based receivers spaced tens of kilometres apart have been established in central Japan5,6 and southern California to monitor the spatial and temporal details of crustal deformation. Here we report the first measurements for a major earthquake by a continuously operating GPS network, the Permanent GPS Geodetic Array (PGGA)7,9 in southern California. The Landers (magnitude Mw of 7.3) and Big Bear (Mw 6.2) earthquakes of 28 June 1992 were monitored by daily observations. Ten weeks of measurements, centred on the earthquake events, indicate significant coseismic motion at all PGGA sites, significant post-seismic motion at one site for two weeks after the earthquakes, and no significant preseismic motion. These measurements demonstrate the potential of GPS monitoring for precise detection of precursory and aftershock seismic deformation in the near and far field.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Detection of crustal deformation from the Landers earthquake sequence using continuous geodetic measurements |
| Series title | Nature |
| Volume | 361 |
| Issue | 6410 |
| Year Published | 1993 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Nature |
| First page | 337 |
| Last page | 340 |
| Google Analytic Metrics | Metrics page |