Results 261 to 270 of about 119,173 (294)

Extensive fluid overpressure in the shallow slow earthquake zone of Nankai Trough off Muroto mapped with high-resolution P-wave velocity. [PDF]

Sci Rep
Flores PCM, Kodaira S, Shiraishi K, Fujie G, Nakamura Y, Arai R.   +5 more
europepmc   +1 more source

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Non-volcanic tremor and low-frequency earthquake swarms

Nature, 2007
Non-volcanic tremor is a weak, extended duration seismic signal observed episodically on some major faults, often in conjunction with slow slip events. Such tremor may hold the key to understanding fundamental processes at the deep roots of faults, and could signal times of accelerated slip and hence increased seismic hazard.
David R, Shelly, Gregory C, Beroza, Satoshi, Ide   +2 more
openaire   +4 more sources

A Granular Jamming Model for Low‐Frequency Earthquakes

Journal of Geophysical Research: Solid Earth, 2021
AbstractA catalog of low frequency events (LFEs) beneath Vancouver Island is analyzed in the context of a granular flow model. The catalog contains origin‐times and magnitudes of 269,423 LFEs grouped within 130 families and recorded between 2003 and 2013. Each family represents a distinct location within the boundary between the subducting Juan de Fuca
C. G. Sammis, M. G. Bostock
openaire   +1 more source

Detecting low-frequency earthquakes with deep learning

2023
Subduction megathrusts are the largest earthquakes occuring worldwide. Yet the generation of large subduction earthquakes is still poorly understood. Recent research revealed that aseismic deformation in the form of slow slip events (SSEs) might play a key rule in the build-up of these events.
Jannes Münchmeyer, Sophie Giffard-Roisin, Marielle Malfante, David Marsan, Anne Socquet   +4 more
openaire   +1 more source

Prevalence of shallow low-frequency earthquakes in the continental crust

Journal of Geophysical Research: Solid Earth, 2020
AbstractLow‐frequency earthquakes (LFEs) that predominantly occur at depths of 20–30 km are categorized as a particular class of earthquakes whose spectral power is concentrated at 1–4 Hz. While the tectonic LFEs along megathrust boundaries occur as shear failure, the genesis of LFEs in the continental plate is poorly understood due to the diversity of
Junichi Nakajima, Akira Hasegawa
openaire   +1 more source

Low-Frequency Properties of Intermediate-Focus Earthquakes

Bulletin of the Seismological Society of America, 2002
Intermediate-focus earthquakes are known to show features such as non-double-couple focal mechanisms that indicate source complexities. To characterize these features, we have systematically studied the low-frequency radiation from 108 intermediate-focus earthquakes recorded by high-performance seismic networks from 1989–1997 whose total moment was > 3
openaire   +1 more source

Phase-Weighted Stacking Applied to Low-Frequency Earthquakes

Bulletin of the Seismological Society of America, 2014
Abstract We apply phase‐weighted stacking (PWS) to the analysis of low‐frequency earthquakes (LFEs) in the Parkfield, California, region and central Cascadia. The technique uses the coherence of the instantaneous phase among the stacked signals to enhance the signal‐to‐noise ratio (SNR) of the stack.
C. H. Thurber, X. Zeng, A. M. Thomas, P. Audet   +3 more
openaire   +1 more source

On corner frequencies, attenuation, and low‐frequency earthquakes

Journal of Geophysical Research: Solid Earth, 2017
AbstractWe have recently suggested that the nearly constant duration of low‐frequency earthquakes (LFEs) (and, equivalently, the band limitation of tectonic tremor) manifests a moment‐duration scaling that is fundamentally different from regular earthquakes and is most easily explained as rupture on asperities of roughly constant dimension.
M. G. Bostock, A. M. Thomas, A. M. Rubin, N. I. Christensen   +3 more
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Empirical Low‐Frequency Earthquakes Synthesized From Tectonic Tremor Records

Journal of Geophysical Research: Solid Earth, 2021
AbstractTectonic tremor and low‐frequency earthquakes (LFEs) are two different representations of the high‐frequency (>1 Hz) components of broadband slow earthquakes, which have been discovered in various tectonic regions. Although LFEs are considered building blocks of tremor, it is difficult to find constituent LFEs for some long‐duration tremor ...
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Volcanic Tremor and Low-Frequency Earthquakes in Iceland

1992
Most earthquakes in Iceland are of the usual high-frequency type, reflecting brittle failure of the crust. Earthquakes lacking energy in the higher frequencies (low-frequency earthquakes) also occur, particularly in volcanic regions. Low-frequency earthquakes in the volcanic systems of Iceland span a broad spectrum with respect to amplitude/duration ...
Bryndís Brandsdóttir, Páll Einarsson
openaire   +1 more source