Earthquake Hazards


The USGS monitors and reports on earthquakes, assesses earthquake impacts and hazards, and conducts targeted research on the causes and effects of earthquakes. We undertake these activities as part of the larger National Earthquake Hazards Reduction Program (NEHRP), a four-agency partnership established by Congress.


Latest Earthquakes

Latest Earthquakes

Latest earthquakes map and list (past 24 hours, M2.5+) from the ANSS (Advanced National Seismic System). Tap/click on "gear icon" for options and settings. Check out our Beta version.

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Earthquake Notification Service (ENS)

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Science for Everyone

Science for Everyone

What if the ShakeAlert Earthquake Early Warning System Had Been Operating During the M6.9 1989 Loma Prieta Earthquake?

How will ShakeAlert® likely perform now on a large earthquake impacting a major urban area? How much warning will you get?

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Remembering Loma Prieta

Leading up to the quake’s 30th anniversary, we will be sharing stories from Loma Prieta, answering questions through our Public Lecture series, sharing products developed since the quake, and more. Check back here for more information.

Video: Where were you the night the Loma Prieta earthquake hit?

Video: What were you thinking when the Loma Prieta earthquake struck?

Video: What lessons have we learned since the Loma Prieta earthquake?

Video: Are we safer today then we were 30 years ago?

Learn More


Date published: January 29, 2020

Magnitude 6.4 Earthquake in Puerto Rico

Links to forecasts and scenerios (below) will continue to be updated, however, text in this story will not be updated unless there is significant change to the aftershock behavior or to the USGS response to the earthquake. 

7-day aftershock forecast [English]

30-day aftershock scenarios [English | Spanish]

Date published: January 28, 2020

Large M7.7 Caribbean Quake Felt as Far Away as Florida

On January 28, 2020, a magnitude 7.7 earthquake struck in the Caribbean Sea, roughly equidistant from the coasts of Jamaica, Cuba and the Cayman Islands. Seismic instruments immediately detected the earthquake that originated at a depth of about 6.2 miles (10 km).

Date published: January 23, 2020

Catalog Shows Complex Rupturing During 2019 Ridgecrest Sequence

The 2019 Ridgecrest earthquake sequence, which startled nearby California residents over the 4 July holiday with magnitude 6.4 and magnitude 7.1 earthquakes, included 34,091 earthquakes overall, detailed in a high-resolution catalog created for the sequence.

Read SSA News...


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Year Published: 2020

Seismicity of the Earth 1900–2018

This map illustrates 119 years of global seismicity in the context of global plate tectonics and the Earth’s physiography. Primarily designed for use by earth scientists, engineers, and educators, this map provides a comprehensive overview of strong (magnitude [M] 5.5 and larger) earthquakes since 1900. The map clearly identifies the locations of...

Hayes, Gavin P.; Smoczyk, Gregory M.; Villaseñor, Antonio H.; Furlong, Kevin P.; Benz, Harley M.
Hayes, G.P., Smoczyk, G.M., Villaseñor, A.H., Furlong, K.P., and Benz, H.M, 2020, Seismicity of the Earth 1900–2018: U.S. Geological Survey Scientific Investigations Map 3446, scale 1:22,500,000, [Supersedes USGS Scientific Investigations Map 3064.]

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Year Published: 2020

Final report to SCEC on the January 8, 2020 SCEC workshop 'Dynamic Rupture TAG Ingredients Workshop – Fault Friction (SCEC Project 19121)'

This workshop was the second of a series of four SCEC5 workshops designed to evaluate the importance of each of the four ingredients required for dynamic earthquake rupture simulations. The four ingredients are: initial stress conditions, fault geometry, rock properties, and fault friction (Figure 1). This workshop included a range of views of...

Harris, Ruth A.; Barall, Michael

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Year Published: 2020

Development of a global seismic risk model

Since 2015 the Global Earthquake Model (GEM) Foundation and its partners have been supporting regional programmes and bilateral collaborations to develop an open global earthquake risk model. These efforts led to the development of a repository of probabilistic seismic hazard models, a global exposure dataset comprising structural and occupancy...

Silva, Vitor; Amo-Oduro, Desmond; Calderon, Alejandro; Costa, Catarina; Dabbeek, Jamal; Despotaki, Venetia; Martins, Luis; Pagani, Marco; Rao, Anirudh; Simionato, Michele; Viganò, Daniele; Yepes-Estrada, Catalina; Acevedo, Ana Beatriz; Crowley, Helen; Horspool, Nick; Jaiswal, Kishor; Journeay, Murray; Pittore, Massimiliano