• Loma Prieta, the 1989 San Francisco Earthquake
  • 1989 Loma Prieta Earthquake Reconstruction and …
  • Faultline: 1989 Loma Prieta Earthquake | Exploratorium

The 1989 Loma Prieta earthquake occured on October 18, 1989 at00:04 UTC in the Santa Cruz Mountains ofCentral California.

Reflections on the Loma Prieta Earthquake, 20 Years …

Loma Prieta Earthquake, CA, 1989, Part 1 - YouTube

This was one of the worst effects of the Loma Prieta earthquake of 1989.
This can either happen throughthe cumulative efforts of a very large number of very small earthquakes,as appears to happen between Parkfield and San Juan Bautista,or through much rarer larger earthquakes, as happened for thepart of the fault around Loma Prieta.

1989 Loma Prieta Earthquake - UC Berkeley Seismology …

This was a horrible time for anyone near the epicenter.Traffic DelaysDuring the Loma Prieta Earthquake, there were many traffic delays.
In the Loma Prieta earthquake, loosely compacted geologic deposits and artificial fills liquefied at many locations around the margins of San Francisco and Monterey Bays and in adjacent river beds. Had the quake been larger or nearer to the heavily developed margin of San Francisco Bay, the damage from liquefaction would have been far greater. The USGS and the Pacific Gas and Electric Company (PG&E) initiated a cooperative research and development agreement in 1997, in part because liquefaction can threaten gas pipelines. As part of this effort, a sophisticated mechanized earth probe is being used to determine whether young sand deposits ringing the Bay may liquefy during strong shaking. The results of these field tests will be used to prepare a new, detailed set of liquefaction-hazard maps for the Bay region.

 

Loma Prieta earthquake strikes near San Francisco - …

All Catholic churches in California began to ask their people for donations to people that were left in need during the Loma Prieta Earthquake.
Although scientists cannot predict the time of destructive earthquakes, they can project the effects of a postulated temblor and, together with engineers, the expected property damage and loss of life. Emergency-response managers, government agencies, corporate planners, and private citizens can use such projections to reduce risk of losses and to facilitate response and recovery after a large quake. USGS scientists are working with numerous agencies and organizations to estimate the impact of future earthquakes at both regional and national scales.

During the Loma Prieta earthquake of 1989, the Pacific Plate moved 6.2 feet to the northwest and 4.3 feet upward over the North American Plate.
The Loma Prieta earthquake was a painful reminder of the need to be aware of natural hazards and to take steps to minimize the potential impact of threatening events. To reduce losses from natural disasters, in 1997 FEMA initiated "Project Impact: Building a Disaster Resistant Community." A pilot effort under this program of public/private partnerships is being conducted in the city of Oakland. Contributing expertise to this effort, the USGS is pursuing a range of projects focused on earthquake hazards threatening the Oakland community:


Loma Prieta Earthquake - Live Science

An example is the California Seismic Hazards Mapping Act of 1990, passed by the California Legislature in the wake of the Loma Prieta earthquake. Intended to assist cities and counties in protecting public health and safety, the Act established a State-wide mapping program to identify areas subject to violent shaking and ground failure. The scientific foundation for the Act came from knowledge and understanding developed by the USGS, CDMG, and cooperating research institutions and consulting firms. In preparing the official maps of seismic-hazard zones, CDMG incorporates the latest information on ground properties, faults, and earthquake potential in the State.

Loma Prieta Earthquake Response Team - 1989earthquake…

During the Loma Prieta earthquake, the USGS and CDMG obtained the first set of recordings of damaging levels of shaking on a wide variety of geologic materials, including soft, unconsolidated sand and clay. These records clearly document that ground shaking is much more violent on the soft sediments around the Bay margins than on bedrock, confirming previous USGS projections. Most importantly, these records provided a firm basis for revising building codes to more fully reflect the need for extra strength in structures built on soft ground. This improved understanding of the shaking hazard on soft ground has led to significant changes in provisions of the forthcoming national building code and to recommended changes to the national highway-bridge code. Because earthquake-resistant design and construction are essential to reducing earthquake losses, these code revisions are a major step toward greater earthquake safety.

Several videos from 1989 Loma Prieta earthquake

Also, on the Nimitz Freeway, the freeway collapsed leaving many people stuck inside of their crushed cars until officers arrived to the scene.

Cities Affected
The Loma Prieta Earthquake stretched out 400,000 square miles.