Loma Prieta earthquake
Overview
Earthquake
An earthquake is the result of a sudden release of energy in the Earth's crust that creates seismic waves. The seismicity, seismism or seismic activity of an area refers to the frequency, type and size of earthquakes experienced over a period of time...
that struck the San Francisco Bay Area
San Francisco Bay Area
The San Francisco Bay Area, commonly known as the Bay Area, is a populated region that surrounds the San Francisco and San Pablo estuaries in Northern California. The region encompasses metropolitan areas of San Francisco, Oakland, and San Jose, along with smaller urban and rural areas...
of California
California
California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...
on October 17, 1989, at 5:04 p.m. local time. Caused by a slip along the San Andreas Fault
San Andreas Fault
The San Andreas Fault is a continental strike-slip fault that runs a length of roughly through California in the United States. The fault's motion is right-lateral strike-slip...
, the quake lasted 10–15 seconds and measured 6.9 on the moment magnitude scale
Moment magnitude scale
The moment magnitude scale is used by seismologists to measure the size of earthquakes in terms of the energy released. The magnitude is based on the seismic moment of the earthquake, which is equal to the rigidity of the Earth multiplied by the average amount of slip on the fault and the size of...
(surface-wave magnitude 7.1) or 6.9 on the open-ended Richter Scale
Richter magnitude scale
The expression Richter magnitude scale refers to a number of ways to assign a single number to quantify the energy contained in an earthquake....
. The quake killed 63 people throughout northern California, injured 3,757 and left some 3,000-12,000 people homeless.
The earthquake occurred during the warm-up practice for the third game of the 1989 World Series
1989 World Series
†: Game 3 was originally slated for October 17 at 5:35 pm; however, it was postponed when an earthquake occurred at 5:04 pm.-Game 1:Saturday, October 14, 1989 at Oakland-Alameda County Coliseum in Oakland, California...
, featuring both of the Bay Area's Major League Baseball
Major League Baseball
Major League Baseball is the highest level of professional baseball in the United States and Canada, consisting of teams that play in the National League and the American League...
teams, the Oakland Athletics
1989 Oakland Athletics season
The Oakland Athletics season saw the A's finish in first place in the American League West division, with a record of 99 wins and 63 losses, seven games in front of the Kansas City Royals. It was their second consecutive AL West title, as well as the second straight year in which they finished...
and the San Francisco Giants
1989 San Francisco Giants season
The 1989 San Francisco Giants season saw the Giants finish in first place in the National League West with a record of 92 wins and 70 losses. It was their second division title in three years. The Giants defeated the Chicago Cubs in five games in the National League Championship Series...
.
