Geology topics

Research about Morgan Hill, California

Source-linked reports with geographic coverage including Morgan Hill, California.

3 recordsLinked to original sources

USGS1987

The Morgan Hill, California, earthquake of April 24, 1984

The Morgan Hill earthquake, a moderate-size (M_g=6.1, ML =6.2, M=6.2) event, was felt throughout central California on April 24, 1984. The epicenter of the earthquake was located near Halls Valley southwest of Mount Hamilton, and the event is presumed to have occurred on the Calaveras fault. Damage, however, was concentrated near the south end of the Anderson Reservoir and in the town of Morgan Hill. A preliminary assessment by the California Office of Emergency Services estimated damage to private property at $7.0 million and to local-government facilities at $0.5 million, for a total of $7.5 million in damage. Acknowledgments.--! appreciate the helpful suggestions of Joseph I. Ziony and Robert D. Brown, Jr. These studies were aided by the generous cooperation of the many landowners who permitted access to their properties.

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USGS1984

The 1984 Morgan Hill, California, earthquake

The Morgan Hill, California, earthquake (magnitude 6.1) of 24 April 1984 ruptured a 30-kilometer-long segment of the Calaveras fault zone to the east of San Jose. Although it was recognized in 1980 that an earthquake of magnitude 6 occurred on this segment in 1911 and that a repeat of this event might reasonably be expected, no short-term precursors were noted and so the time of the 1984 earthquake was not predicted. Unilateral rupture propagation toward the south-southeast and an energetic late source of seismic radiation located near the southeast end of the rupture zone contributed to the highly focused pattern of strong motion, including an exceptionally large horizontal acceleration of 1.29g at a site on a dam abutment near the southeast end of the rupture zone.

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USGS1984

The Morgan Hill, California earthquake of April 24, 1984; a preliminary report; Volume II

The computer plots included in this volume have been prepared to accompany the article in Volume I titled "Strong-Motion Results from the Main Shock of April 24, 1984." The plots serve two functions. First, to provide a visual description of the recorded accelerations and their processed results in order that a selection can be made of specific records that can be further studied using the available digital data, and second, to provide plots from which specific earthquake or record parameters can be read, measured, or scaled directly.

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