********************************************************************
Fall AGU Session: Observations and Interpretations of Low-Frequency
Earthquakes in
Volcanic and Nonvolcanic Environments
********************************************************************
From: Seth Moran <smoran@xxxxxxxx>
Dear colleagues,
We would like to encourage you to submit abstracts to a special session on
"Observations and Interpretations of Low-Frequency Earthquakes in Volcanic
and Nonvolcanic Environments" at the Fall 2006 AGU meeting in San
Francisco. This session attempts to integrate observations of
low-frequency earthquakes from a variety of environments including
volcanoes, slabs and ordinary faults. A full description follows. Please
consider submitting to the session and feel free to contact any of the
conveners with any questions.
__________________________
V30: Observations and Interpretations of Low-Frequency Earthquakes in
Volcanic and Nonvolcanic Environments
Sponsor: Volcanology, Geochemistry, and Petrology
CoSponsor: Seismology, Tectonophysics
Description: Events with dominantly low-frequency (0.5 - 5 Hz) waveforms
are one of the major classes of seismic events recorded by seismometers at
volcanic systems. Low-frequency (LF) events have also been observed in
subducting slabs, mainly in conjunction with so-called episodic
tremor-and-slip episodes. At volcanic systems LF events are commonly
observed in association with volcanic unrest or eruption, an observation
that has led to the dominant paradigm that LF events are generated by
vibrations in a fluid- or gas-filled crack. This model has been tested in
the laboratory and shown to be consistent with observations at a number of
erupting volcanoes. However, recent observations and research have
highlighted that ordinary stick-slip failure may produce LF earthquakes in
certain volcanic settings due to exceptionally high strain rates within
the magma, low rupture velocities, and/or complexities in the path between
source and seismometer. The goals of this session are to investigate the
range of mechanisms that may produce LF events and the range of settings
in which various types of LF events occur. We particularly seek
contributions that elucidate methods to distinguish mechanisms and
pinpoint processes.
Conveners:
Seth Moran, USGS, smoran@xxxxxxxx
Masatoshi Miyazawa, Color. School of Mines, mmiyazaw@xxxxxxxxx
Emily Brodsky, UC Santa Cruz, brodsky@xxxxxxxxxxx
==============================================================
To unsubscribe from the volcano list, send the message:
signoff volcano
to: listserv@xxxxxxx, or write to: volcano-request@xxxxxxxx
To contribute to the volcano list, send your message to:
volcano@xxxxxxxx Please do not send attachments.
==============================================================
