Near-field investigations of the landers earthquake sequence, april to july 1992.
نویسندگان
چکیده
The Landers earthquake, which had a moment magnitude (M(w)) of 7.3, was the largest earthquake to strike the contiguous United States in 40 years. This earthquake resulted from the rupture of five major and many minor right-lateral faults near the southern end of the eastern California shear zone, just north of the San Andreas fault. Its M(w) 6.1 preshock and M(w) 6.2 aftershock had their own aftershocks and foreshocks. Surficial geological observations are consistent with local and far-field seismologic observations of the earthquake. Large surficial offsets (as great as 6 meters) and a relatively short rupture length (85 kilometers) are consistent with seismological calculations of a high stress drop (200 bars), which is in turn consistent with an apparently long recurrence interval for these faults.
منابع مشابه
State of Stress from Focal Mechanisms Before and After the 1992 Landers Earthquake Sequence
The state of stress in the Eastern California Shear Zone (ECSZ) changed significantly because of the occurrence of the 1992 Mw 6.1 Joshua Tree and the Mw 7.3 Landers earthquakes. To quantify this change, focal mechanisms from the 1975 Galway Lake sequence, the 1979 Homestead Valley sequence, background seismicity from 1981 to 1991, and the 1992 Landers sequence are inverted for the state of str...
متن کاملOn the derivation of coseismic displacement fields using differential radar interferometry The Landers earthquake
We present a map of the coseismic displacement field resulting from the Landers, California, June 28, 1992, earthquake derived using data acquired from an orbiting high-resolution radar system. We achieve results more accurate than previous space studies and similar in accuracy to those obtained by conventional field survey techniques. Data from the ERS 1 synthetic aperture radar instrument acq...
متن کاملThe 1992 Landers Earthquake Sequence: Seismological Observations
The (Mw6.1, 7.3, 6.2) 1992 Landers earthquakes began on April 23 with the Mw6.1 1992 Joshua Tree preshock and form the most substantial earthquake sequence to occur in California in the last 40 years. This sequence ruptured almost 100 km of both surficial and concealed faults and caused aftershocks over an area 100 km wide by 180 km long. The faulting was predominantly strike slip and three mai...
متن کاملImaging Co-Seismic Fault Zone Deformation from Air Photos: the Kickapoo Stepover along the Surface Ruptures of the 1992 Landers Earthquake
Co-seismic deformation of the ground can be measured from aerial views taken before and after an earthquake. As a test example we chose the area of the Kickapoo-Landers stepover along the 1992 Landers earthquake zone, using air photos in a scale of 1:40,000 scanned at 0.4 m in resolution. A pair of photos acquired after the earthquake is used to assess the accuracy and evaluate various sources ...
متن کاملCoseismic surface deformation from air photos: The Kickapoo step over in the 1992 Landers rupture
[1] Coseismic deformation of the ground can be measured from aerial views taken before and after an earthquake. We chose the area of the Kickapoo-Landers step over along the 1992 Landers earthquake zone, using air photos (scale 1:40,000) scanned at 0.4 m resolution. Two photos acquired after the earthquake are used to assess the accuracy and to evaluate various sources of noise. Optical distort...
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ورودعنوان ژورنال:
- Science
دوره 260 5105 شماره
صفحات -
تاریخ انتشار 1993