Natural Hazards

Filter Total Items: 495
Date published: August 6, 2019
Status: Active

Earthquake Hazards 201 - Technical Q&A

A list of technical questions & answers about earthquake hazards.

Date published: August 6, 2019
Status: Active

Earthquake Hazards 101 - the Basics

What is earthquake hazard?

Earthquake ground shaking varies from place to place and the hazard mapping in this project will show this variability. The mapped hazard refers to an estimate of the probability of exceeding a certain amount of ground shaking, or ground motion, in 50 years. The hazard depends on the magnitudes and locations of likely earthquakes, how often they occur, and the...

Date published: August 6, 2019
Status: Active

Introduction to the National Seismic Hazard Maps

  

Date published: August 5, 2019
Status: Active

Request for Hazard Modeling Contributions

  

Date published: August 5, 2019
Status: Completed

The Great M7.9 1857 Fort Tejon Earthquake

The Last "Big One"

Date published: August 5, 2019
Status: Completed

M6.9 October 17, 1989 Loma Prieta Earthquake

On October 17, 1989, at 5:04:15 p.m. (PDT), a magnitude 6.9 earthquake severely shook the San Francisco and Monterey Bay regions. The epicenter was located near Loma Prieta peak in the Santa Cruz Mountains, approximately 14 km (9 mi) northeast of Santa Cruz and 96 km (60 mi) south-southeast of San Francisco.

Date published: August 5, 2019
Status: Completed

M5.8 August 23, 2011 Mineral, Virginia

On August 23, 2011 tens of millions of people along the East Coast suddenly felt the earth shaking from the largest earthquake in the eastern U.S. since the M5.8 earthquake in 1944 near Cornwall and Massena, New York.

Date published: August 5, 2019
Status: Completed

M5.3 2017 Soda Springs, Idaho Sequence

- last updated September 27, 2017 1:40 PST

Date published: August 5, 2019
Status: Completed

February 2018 Danville, California Sequence

Mon Mar 5, 7:30pm PT

The earthquake swarm near Danville had continued to taper off over the past week. Since Feb 23 there have only been two earthquakes in the sequence larger than magnitude 2.0, a magnitude 2.0 on Feb 27 and a magnitude 2.5 on Mar 1. The most likely scenario looking forward is for this sequence to continue to taper off.

Date published: July 29, 2019
Status: Completed

What are the Effects of Earthquakes?

The effects from earthquakes include ground shaking, surface faulting, ground failure, and less commonly, tsunamis.