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Earthquake interaction, forecasting, and prediction

The San Andreas Fault near Juniper Hills, Calif.
Posted inResearch Spotlights

A New Method Produces Improved Surface Strain Rate Maps

by Jack Lee 19 July 202128 September 2021

The transdimensional Bayesian approach handles GPS data limitations better than existing methods and may assist future seismic hazard assessment studies.

Plot showing the distribution of magnitudes (blue) and positive magnitude differences (red) for aftershocks of the 2019 M7.1 Ridgecrest California earthquake
Posted inEditors' Highlights

A New Robust Estimator of Earthquake Magnitude Distribution

by A. Helmstetter 19 March 202118 March 2021

The b-value, which describes the fraction of large versus small earthquakes, is less sensitive to transient changes in detection threshold and may improve the detection of precursory changes.

Aerial view of the San Andreas Fault in California on the Carrizo Plain
Posted inResearch Spotlights

Earthquake Statistics Vary with Fault Size

by Aaron Sidder 21 October 2019

A theoretical study explores why small earthquake sources can produce quasiperiodic sequences of identical events, whereas earthquakes on large faults are intrinsically more variable.

Diagram showing how groundwater disappears into crustal ruptures formed during an earthquake
Posted inEditors' Highlights

Groundwater Drawn Downward After Kumamoto Quake

by Marc F. P. Bierkens 14 August 20191 August 2019

A unique set of high-frequency groundwater level monitoring reveals a loss of approximately ten million cubic meters of groundwater after a major earthquake.

Victorian-style houses lean dramatically to the right after an earthquake.
Posted inNews

More Than a Million New Earthquakes Spotted in Archival Data

by Katherine Kornei 19 April 2019

By reanalyzing seismic records, researchers found a plethora of tiny earthquakes in Southern California that trace new fault structures and reveal how earthquakes are triggered.

Children help salvage and remove debris after the 2015 earthquake in Nepal
Posted inResearch Spotlights

How Do Main Shocks Affect Subsequent Earthquakes?

by Terri Cook 29 March 201918 April 2019

The results of a novel analysis of aftershock size distribution have important implications for more realistically assessing the seismic hazard of earthquake sequences.

A woman walks past debris from a building damaged by an earthquake in Oklahoma
Posted inResearch Spotlights

Forecasting Seismicity from Wastewater Disposal in Oklahoma

by Terri Cook 8 March 2019

Mandated wastewater injection reductions in effect since 2016 are inadequate for preventing future, large-magnitude earthquakes in the state, according to a new induced seismicity model.

Fault scarp in Italy's Apennine Mountains
Posted inScience Updates

How Earthquakes Start and Stop

by D. Marsan, G. C. Beroza and J. Gomberg 14 March 2018

Earthquakes: Nucleation, Triggering, Rupture, and Relationships to Aseismic Processes; Cargèse, Corsica, France, 2–6 October 2017

Kate Scharer examining sediments disrupted by the San Andreas Fault near Desert Hot Springs, California.
Posted inResearch Spotlights

Catching Glimpses of Centuries-Old Earthquakes

by S. Witman 5 May 2017

Researchers in the western United States survey the earthquakes that have torn up California for the past millennium.

Matt Lancaster sets up a GPS receiver.
Posted inScience Updates

Using Strain Rates to Forecast Seismic Hazards

by E. L. Evans 14 March 201728 September 2021

Workshop on Geodetic Modeling for Seismic Hazard; Menlo Park, California, 19 September 2016

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