Category: Earthquakes

This seismometer in the Shasta-Trinity National Forest in Northern California, along with more than 200 seismometers in various stages of implementation across California, Oregon and Washington, is the result of a close partnership between the U.S. Geological Survey and the U.S. Department of Agriculture’s Forest Service to expand seismic monitoring…

A magnitude 6.4 earthquake struck near Petrinja, Croatia, about 30 miles southeast of the capital of Zagreb, on December 29, 2020 at about 6:20 am Eastern Time (12:20 pm local time). Seismic instruments indicate the earthquake originated at a depth of about 6 miles…

From Mindteaser Monday to Fault Friday, the Earthquake Twitter Team is off to a rollicking start. The team behind the account is dedicated to providing timely and accurate messages during working hours to help the public understand when, where, and how big earthquakes can be.  Since earthquakes can happen at any time, account managers occasionally respond to significant off-hour earthquakes. Example of…

Shaded relief map views of the 2019 Ridgecrest sequence. Events are color coded by depth. Depth is referenced to a surface elevation of 0.7 km above sea level. Dot size does not scale with magnitude. Stars indicate Mw 6.4 and 7.1 epicenter locations…

A magnitude 7 earthquake struck offshore of the city of Neon Karlovasion, Greece (north of Simos Island in the eastern Agean Sea) on October 30th, 2020 at 1:51 pm local time (11:51 UTC). Seismic instruments indicate the earthquake originated at a depth of 13 miles (21 kilometers).    The earthquake struck…

According to a recently published study by U.S. Geological Survey scientists, the USGS real-time earthquake web pages also quake with activity following a seismic event. Look at these numbers: 3.6 billion total data requests, including 29 million page views by 7.1 million…

U.S. Geological Survey scientists have determined that nearly half of Americans are exposed to potentially damaging earthquakes based on where they work and live. Still others will be at risk when traveling. Everyone everywhere should know how to protect themselves during an earthquake. Be…

A new digital geologic map of the greater Portland-Vancouver-Hillsboro metropolitan area of Oregon and Washington will support emergency response, conservation, agriculture and recreation. https://pubs.er.usgs.gov/publication/sim3443 (Public domain.) The U.S. Geological Survey’s bi-state map, which covers more than 2500 square miles and would measure 13-feet wide if…

October 7, 2020 Screenshot of Latest Earthquakes (as of October 7, 8:00am PDT) showing the Westmoreland Earthquake Swarm that began on the afternoon of Sep 30, 2020. Earthquakes are shown as circles with the most recent in red. (Public domain.) We have been…

USGS:  Start with Science The USGS works with many partners to monitor, assess and conduct research on a wide range of natural hazards. USGS science provides policymakers, emergency managers and the public the understanding needed to enhance family and community preparedness, response…

Bill Barnhart (Public domain.) Bill began work on August 31st, and will help to support various program office activities, particularly including those within ANSS, which have expanded significantly in recent years. Bill’s efforts will be extremely important for the future success of our…

08/14/2020: Map showing the Salton Sea, CA earthquake swarm of August 2020 (as of August 14, 2020 12pm Pacific). Circles are earthquake locations, red indicates an earthquake in the past hour, orange the past 24 hours, and yellow the past 7 days.…

The earthquake struck about two miles southeast of Sparta. The event was widely felt, with more than 80,000  “Did You Feel It?” reports submitted as of 1 p.m. eastern daylight time. Most reported weak to light shaking while those closest to the…

In the early morning hours of April 18th, 1906, an alarming shake and rumble underfoot along the coastal areas of northern California gave way to a living nightmare of unprecedented devastation.  At 5:12am, what would be considered one of the most devastating earthquake…

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Feeling the ground beneath you shake and seeing the environment around you roll and rock can leave one feeling wary of what is to come next. This was certainly the case for the community of Ridgecrest, California, on July 4th, 2019, as they experienced a magnitude 6.4 earthquake. As scientists and…

The earthquake struck about seven miles southwest of Santa María Zapotitlán, Mexico. Perceived shaking for the quake was very strong. The event was widely felt, with more than 600 ”Did You Feel It?” reports thus far submitted.   USGS scientists expect that this event will trigger aftershocks, but these will decrease in…

  The 1994 M6.7 Northridge, CA Shakemap showing MMI (Modified Mercalli Intensity) levels of shaking, with the earthquake epicenter shown as a red star, and the fault shown as a rectangle. The innermost dotted circle doesn’t include the communication or reaction time…

Seismic instruments indicate the earthquake originated at a depth of  1.7 miles (2.8 km). The quake occurred as the result of strike slip faulting in the shallow crust of the North America plate. The earthquake struck about 34.7 miles (56 km) west…

Around 7 a.m. local time May 2, a magnitude 5.4 earthquake struck offshore south of Tallaboa, Puerto Rico on the southern side of the island. There are media reports of local damage to some older structures and widespread power outages across Puerto…

Photograph of Gavin P Hayes (Credit: Gavin Hayes, USGS. Public domain.) Gavin comes to this position having spent the past 12 years as a research geophysicist at the USGS National Earthquake Information Center (NEIC) within the Geologic Hazards Science Center in Golden, CO.…

The U.S. Geological Survey (USGS) is currently soliciting project proposals for Fiscal Year (FY) 2021 grants on earthquake hazards science. The USGS is authorized to award up to $7 million in funding. Interested researchers can apply online at GRANTS.GOV under funding Opportunity Number G20AS00042.…

The U.S Geological Survey announces that the agency will award more than $20 million in 2020 for applied earthquake research, seismic and geodetic monitoring activities in moderate- to high-risk areas nationwide. More than 40 universities, state geological surveys, and private institutions are the…

During evening rush hour, at roughly 5:52 p.m. local time, a large earthquake struck about 72 miles northeast of Boise. Perceived shaking for the quake was very strong. The event was widely felt, with close to 16,000 “Did You Feel It?” reports…

At 10:16 a.m. CDT on March 26 a moderate earthquake struck about 120 miles from Midland, Texas and 50 miles from Carlsbad, New Mexico. Perceived shaking for the quake was strong. Although the epicenter is in a sparsely populated area, the event was widely felt, with more than 1,000 “Did You Feel…

On March 18, 2020, a magnitude 5.7 earthquake struck outside of Salt Lake City, Utah. Seismic instruments indicate the earthquake originated at a depth of 6.6 miles (10.6 km). The USGS has updated the aftershock forecast. Over the next week there is a…

Update – Wednesday, January 29 (in English; Spanish below) 2020 Southwest Puerto Rico Earthquake Sequence In a new report released today, USGS experts estimated that aftershocks from the magnitude 6.4 Jan. 7, 2020, earthquake will persist for years to decades, although with…

The U.S. Geological Survey continues to monitor the seismic activity in the region. The earthquake is a strike-slip event consistent with it occurring along the Oriente Fault. Aftershocks, which are already occurring, are normal and expected. Despite the large size of the earthquake,…

This Seismological Society of America (SSA) news release features research by USGS scientist David Shelly. Source:

2020 Puerto Rico Earthquake Sequence Earthquakes detected between December 28, 2019 as of January 16, 2020. Subject to updates. Spanish Version.  U.S. Department of the InteriorU.S. Geological Survey. (Public domain.) The earthquake sequence in southwest Puerto Rico began with a magnitude 4.7 earthquake…