Ground fracturing at the southern end of Summit Ridge caused by October 17, 1989 Loma Prieta, California, earthquake sequence (maps of Summit Ridge Shear Zones, en echelon tension cracks, complex and compound fractures, and small faults that formed coactively with the earthquake sequence)

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The Loma Prieta earthquake of 17 October 1989 was the first of three large earthquakes that occurred in California in less than 5 years. The main shock of the Loma Prieta earthquake was deep-seated, the rupture zones of the main shock did not reach the surface, and the earthquake produced enigmatic surface ruptures along the frontal faults of the Coast Range and in the epicentral area that were explained in several quite different ways. The Landers earthquake of 28 June 1992 was near surface and produced more than 80 km of spectacular surface rupture of many different kinematic expressions. Detailed ... continued below

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Medium: P; Size: 38 p.

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Martosudarmo, S.Y.; Johnson, A.M. & Fleming, R.W. December 31, 1997.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 66 times . More information about this report can be viewed below.

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  • Martosudarmo, S.Y. BPP Technologi, Jakarta (Indonesia)
  • Johnson, A.M. Purdue Univ., West Lafayette, IN (United States). Harry Fielding Reid Earthquake Research Lab.
  • Fleming, R.W. Geological Survey, Denver, CO (United States)

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Description

The Loma Prieta earthquake of 17 October 1989 was the first of three large earthquakes that occurred in California in less than 5 years. The main shock of the Loma Prieta earthquake was deep-seated, the rupture zones of the main shock did not reach the surface, and the earthquake produced enigmatic surface ruptures along the frontal faults of the Coast Range and in the epicentral area that were explained in several quite different ways. The Landers earthquake of 28 June 1992 was near surface and produced more than 80 km of spectacular surface rupture of many different kinematic expressions. Detailed study of fractures at Landers has provided a basis for re-evaluating earlier work on fractures produced by the Loma Prieta earthquake. This paper is a description of some of the fractures produced by the Loma Prieta earthquake and a discussion of their causes. Detailed mapping (scale of 1:250) in an area on either side of Summit Road and between Morrell Cutoff Road in the northwest and the intersection of Summit Road and San Jose-Soquel Road in the southeast has provided documentation of fracture orientations and differential displacements required to decipher the ground deformation in that area during the Loma Prieta earthquake.

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Medium: P; Size: 38 p.

Notes

OSTI as DE99000962

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  • Other Information: PBD: 1997

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  • Other: DE99000962
  • Report No.: USGS-OFR--97-129
  • Grant Number: FG02-93ER14365
  • DOI: 10.2172/677053 | External Link
  • Office of Scientific & Technical Information Report Number: 677053
  • Archival Resource Key: ark:/67531/metadc703485

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  • December 31, 1997

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 18, 2016, 6:50 p.m.

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Martosudarmo, S.Y.; Johnson, A.M. & Fleming, R.W. Ground fracturing at the southern end of Summit Ridge caused by October 17, 1989 Loma Prieta, California, earthquake sequence (maps of Summit Ridge Shear Zones, en echelon tension cracks, complex and compound fractures, and small faults that formed coactively with the earthquake sequence), report, December 31, 1997; Denver, Colorado. (digital.library.unt.edu/ark:/67531/metadc703485/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.