Asked by: Andriana Monnerjahn
Asked in category: news and politics, disasters, news and politics, disasters
Last Updated: 18th Jun 2024

How many aftershocks were there in the San Francisco earthquake 1989?

Aftershocks. Aftershocks of magnitude 5.2 occurred within 2.5 minutes of the main shock. In the week that followed Loma Prieta's main shock, 20 aftershocks of magnitude 4.0 or higher and more than 300 of magnitude 2.5 or higher were recorded. There were thousands of aftershocks.



It is also important to know how long the 1989 earthquake in San Francisco lasted.

It takes approximately 15 seconds

Also, what happened to the Golden Gate Bridge in 1989? Astaneh's seriousness increases when the conversation turns to earthquakes. Astaneh admits that bridge officials acted quickly to prevent this from happening after they had experienced the LomaPrieta earthquake quake in 1989. The earthquake was magnitude 6.9 and the Golden Gate Bridge sustained only minor damage.

Secondly, what caused the Bay Bridge to collapse in 1989?

On October 17, 1989 at 5:04 p.m., a 7.1 magnitude earthquake struck the Bay Area. The lower deck of the Bay Bridge crashed into the upper deck and the deck below it. It was the rigid structure on the East Span's truss bridge that made it more vulnerable to failure.

How large was the 1989 Loma Prieta earthquake?

At 5:04:15 PM (PDT), a magnitude 6.9 earthquake shook San Francisco and Monterey Bay. The epicenter was located at Loma Prieta peak, Santa Cruz Mountains, approximately 14km (9 mi) northeast and 96km (60 mi) South-Southeast of San Francisco.