We were both going to our first World Series Game.This game was dubbed the “Battle of the Bay” as the San Francisco Giants were taking on the across-the-bay rival, the Oakland A’s.We got to the game two hours early to soak in the atmosphere and be there for the opening ceremony. The portion of the Pacific plate including Santa Cruz and Watsonville moved 6.5 feet north and 4.6 feet up relative to the portion of the North American plate. Based on statistical studies of average California aftershock sequences, the USGS estimated that there was a 12 percent chance of an aftershock of magnitude 6 or greater in the two months following October 21, 1989.
hikers have been trekking up to the epicenter of the loma prieta earthquake today.
I asked ATT to share with me how they and the US government have gone about making sure our first responders can communicate and collaborate seamlessly in times of natural disasters and they sent me this outline of what has been done since 9/11.The response to this problem was the creation of FirstNet. I asked ATT officials what they did to help connect all of the disperse first responder agencies and they said that Pacific Bell employees in San Francisco strung temporary cables to connect the emergency command posts.And in Oakland, ATT field technicians rounded up company vehicles with ladders and lights that rescuers would need, even helping evacuate survivors in the collapse scene of the Cypress area of I-880 freeway.In many ways, the Loma Prieta quake was a wake-up call for the telecom world.
Data from these instruments show about 10-15 seconds of motion greater than 0.1 times the acceleration of gravity (0.1 g).
The section of the San Andreas fault immediately to the north of the Loma Prieta segment was identified in the same studies as having a 20 percent probability of producing an event of magnitude 7. The attacks on the Twin Towers in NYC on September 11, 2001, was another national disaster that tested our communications networks. Those calls overloaded the lines and brought most cell phone lines to their knees. The quake lasted for two full minutes.One of the more amazing things about this quake and Candlestick Park stadium was that there was almost no structural damage anyone could see. Much of the information in this article was provided by the U. S. Geological Survey (USGS). Most people in the vicinity of the earthquake epicenter felt strong ground shaking for about 10 seconds to 15 seconds.
The section of the San Andreas fault that ruptured on October 17 probably also ruptured in 1865 and 1906. By 5:00 pm, most were in their seats as the crowd knew the players would be announced soon and the game would finally start at 5:30. For comparison, the San Francisco earthquake was magnitude 8.3, the rupture was 280 miles long, and the maximum offset was more than 20 feet. P wave and S wave arrivals are indicated. But after the call to New York, the cell phone lines died. Epicenter map of the Loma Prieta earthquake and the first four days of aftershocks. This earthquake was the largest earthquake to occur in the San Francisco Bay area since 1906, and the largest anywhere in California since 1952.
These preliminary magnitudes were determined from only a handful of stations. P waves travel at speeds of about 3.1-3.7 miles per second through average crustal materials, whereas S waves travel more slowly, about 2.0 miles per second.
Note, however, that the earthquake occurred near the coast, so half of the potential felt area is westward in the Pacific Ocean. The peak acceleration on each record is shown at the right. In general, the largest of these events is about one magnitude unit smaller than the mainshock, although there are exceptions.
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