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Seismicity and tectonics

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.

Two maps of the Japanese islands showing distribution of volcanoes (top) and areas of large crustal earthquakes analyzed in this study (bottom).
Posted inEditors' Highlights

The First Systematic Search for Enervated Earthquakes

by S. Ide 11 May 202128 September 2021

High quality data from Japan provides answers on where and when “enervated” earthquakes occur.

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.

Imaging seismic sources with waveforms ranging from the laboratory scale to the global scale
Posted inEditors' Vox

Imaging Seismic Sources

by L. Li and B. Schwarz 30 April 2020

Waveform‐based location methods are being used to better characterize and understand seismic sources from the laboratory to the global scale.

Large earthen rupture foregrounds a brightly colored school building damaged by an earthquake.
Posted inNews

Geodetic Data Pinpoint Earthquake-Prone Regions of the Himalayas

by Katherine Kornei 19 March 2020

GPS measurements of the Indian and Eurasian plates reveal four locked segments most likely to produce large earthquakes.

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.

A woman displays a Raspberry Shake seismometer in front of construction typical of many neighborhoods in Haiti.
Posted inScience Updates

Monitoring Haiti’s Quakes with Raspberry Shake

by E. Calais, D. Boisson, S. Symithe, R. Momplaisir, C. Prépetit, S. Ulysse, G. P. Etienne, F. Courboulex, A. Deschamps, T. Monfret, J.-P. Ampuero, B. M. de Lépinay, V. Clouard, R. Bossu, L. Fallou and E. Bertrand 17 May 2019

A network of “personal seismometers” is intended to complement Haiti’s national seismic network to engage and inform residents about earthquake hazards and preparation.

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.

Quill volcano Sint Eustatius Island
Posted inScience Updates

Project VoiLA: Volatile Recycling in the Lesser Antilles

by S. Goes, J. Collier, J. Blundy, J. Davidson, N. Harmon, T. Henstock, J. M. Kendall, C. Macpherson, A. Rietbrock, K. Rychert, J. Prytulak, J. van Hunen, J. J. Wilkinson and M. Wilson 14 March 201914 March 2019

Deep water cycle studies have largely focused on subduction of lithosphere formed at fast spreading ridges. However, oceanic plates are more likely to become hydrated as spreading rate decreases.

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