Loma prieta earthquake

How disruptive is retrofitting work? How do I know whether my house needs earthquake improvements? Some information about the earthquake resistance of your house can be obtained simply from knowing when it was constructed. Almost any house built before the s can be improved in such a way as to reduce earthquake risk.

Loma prieta earthquake

Reminiscent of the earthquakethe earth shook, like a table bumped, causing a house of cards to fall. The earthquake lasted for 15 to 20 seconds.

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Its epicenter was at geographical coordinates The fault rupture did not break the ground surface. The focal depth was 11 miles, which is unusually deep. Typical California earthquake focal depths are 4 to 6 miles. That earthquake was the largest to occur in the San Francisco Bay area since Sources place the death toll at between 63 to 68 people.

Deaths in Santa Cruz occurred when brick storefronts and sidewalls in the historic downtown what was then called the Pacific Garden Mall tumbled down on people exiting the buildings.

The earthquake caused severe damage as far as 70 miles away, most notably in San Francisco, Oakland, the San Francisco Peninsula, and in areas closer to the epicenter in the communities of Santa Cruz, Watsonville, and Los Gatos.

Extensive damage also occurred in San Francisco's Marina District, where many expensive homes built on filled ground collapsed from liquefaction of soil used over the years to fill in the waterfront and then built upon.

In addition, more than 1, landslides and rockfalls occurred in the epicentral zone in the Santa Cruz Mountains. One slide, on State Highway 17, disrupted traffic for about a month. Fortunately, less than half of the 65,plus fans had reached their seats, lessening the load on the structure of the stadium.

Because the quake occurred during the evening rush hour, there could have been a large number of cars on the freeways at the time, which might have endangered many hundreds of commuters. Fortunately, in an unusual convergence of events, many people had left work early or were participating in World Series early after-work parties.

Therefore, the usually crowded highways bore exceptionally light traffic at the time. One of the major impacts of the earthquake on everyday life was transportation. The earthquake caused the Cypress Viaduct to collapse, resulting in 42 deaths.

The viaduct was a raised freeway section that was part of the Nimitz freeway in Oakland, which is Interstate The viaduct had two traffic decks. Resonant vibration caused 50 of the spans of the Viaduct to collapse. The reinforced concrete frames of those spans were mounted on weak soil.

As a result, the natural frequency of those spans coincided with the forcing frequency of the earthquake ground motion.Earthquake Retrofitting and Seismic Upgrades Many of our customers tell us they do not know what questions they should be asking.

While the basics of earthquake retrofitting are simple, the retrofitting process can be complex. Earthquake Loma Prieta California The Loma Prieta earthquake was a major earthquake that struck the San Francisco Bay Area of California on October 17, , at p.m. local time.

Caused by a slip along the San Andreas Fault, the quake lasted 10–15 seconds and measured on the moment. Comment: A copy that has been read, but remains in excellent condition.

Pages are intact and are not marred by notes or highlighting, but may contain a neat previous owner name. The . San Francisco–Oakland earthquake Map of the San Francisco–Oakland earthquake (also known as the Loma Prieta earthquake). The quake struck with a moment magnitude of on October 17, just before the start of the third game of the World Series, which was being held at San Francisco's Candlestick Park.

On October 17, , the Loma Prieta earthquake hits the San Francisco Bay Area.

Loma prieta earthquake

The earthquake, centered in the Santa Cruz Mountains, took the lives of 63 Bay Area residents and injured more. Death, destruction, and havoc were again visited upon the San Francisco area in Reminiscent of the earthquake, the earth shook, like a table bumped, causing a house of cards to fall..

The Loma Prieta — literally, dark knoll — earthquake occurred on October 17, , in the greater San Francisco Bay Area in California at p.m. local time and measured on the Richter.

Loma Prieta earthquake - Wikipedia