A temporary network of 69 three-component seismic stations captured
a major seismic sequence in Long Valley caldera in 1997. We performed
a tomographic inversion for crustal structure beneath a 28 km x 16
km area encompassing part of the resurgent dome, the south moat,
and Mammoth Mountain. Resolution of crustal structure beneath the
center of the study volume was good down to \~3 km below sea level
(\~5 km below the surface). Relatively high wave speeds are associated
with the Bishop Tuff and lower wave speeds characterize debris in
the surrounding moat. A low-Vp/Vs anomaly extending from near the
surface to \~1 km below sea level beneath Mammoth Mountain may
represent a CO2 reservoir that is supplying CO2-rich springs, venting
at the surface, and killing trees. We investigated temporal variations
in structure beneath Mammoth Mountain by differencing our results
with tomographic images obtained using data from 1989/1990. Significant
changes in both Vp and Vs were consistent with the migration of CO2
into the upper 2 km or so beneath Mammoth Mountain and its depletion
in peripheral volumes that correlate with surface venting areas.
Repeat tomography is capable of detecting the migration of gas beneath
active silicic volcanoes and may thus provide a useful volcano monitoring
tool.
%0 Journal Article
%1 foulger_etal:2003
%A Foulger, G. R.
%A Julian, B. R.
%A Pitt, A. M.
%A Hill, D. P.
%A Malin, P. E.
%A Shalev, E.
%D 2003
%J Journal of Geophysical Research
%K geophysics seismology
%N B3
%P 2147
%R 10.1029/2000JB000041
%T Three-dimensional crustal structure of Long Valley caldera, California,
and evidence for the migration of CO2 under Mammoth Mountain
%U http://dx.doi.org/10.1029/2000JB000041
%V 108
%X A temporary network of 69 three-component seismic stations captured
a major seismic sequence in Long Valley caldera in 1997. We performed
a tomographic inversion for crustal structure beneath a 28 km x 16
km area encompassing part of the resurgent dome, the south moat,
and Mammoth Mountain. Resolution of crustal structure beneath the
center of the study volume was good down to \~3 km below sea level
(\~5 km below the surface). Relatively high wave speeds are associated
with the Bishop Tuff and lower wave speeds characterize debris in
the surrounding moat. A low-Vp/Vs anomaly extending from near the
surface to \~1 km below sea level beneath Mammoth Mountain may
represent a CO2 reservoir that is supplying CO2-rich springs, venting
at the surface, and killing trees. We investigated temporal variations
in structure beneath Mammoth Mountain by differencing our results
with tomographic images obtained using data from 1989/1990. Significant
changes in both Vp and Vs were consistent with the migration of CO2
into the upper 2 km or so beneath Mammoth Mountain and its depletion
in peripheral volumes that correlate with surface venting areas.
Repeat tomography is capable of detecting the migration of gas beneath
active silicic volcanoes and may thus provide a useful volcano monitoring
tool.
@article{foulger_etal:2003,
abstract = {A temporary network of 69 three-component seismic stations captured
a major seismic sequence in Long Valley caldera in 1997. We performed
a tomographic inversion for crustal structure beneath a 28 km x 16
km area encompassing part of the resurgent dome, the south moat,
and Mammoth Mountain. Resolution of crustal structure beneath the
center of the study volume was good down to \~{}3 km below sea level
(\~{}5 km below the surface). Relatively high wave speeds are associated
with the Bishop Tuff and lower wave speeds characterize debris in
the surrounding moat. A low-Vp/Vs anomaly extending from near the
surface to \~{}1 km below sea level beneath Mammoth Mountain may
represent a CO2 reservoir that is supplying CO2-rich springs, venting
at the surface, and killing trees. We investigated temporal variations
in structure beneath Mammoth Mountain by differencing our results
with tomographic images obtained using data from 1989/1990. Significant
changes in both Vp and Vs were consistent with the migration of CO2
into the upper 2 km or so beneath Mammoth Mountain and its depletion
in peripheral volumes that correlate with surface venting areas.
Repeat tomography is capable of detecting the migration of gas beneath
active silicic volcanoes and may thus provide a useful volcano monitoring
tool.},
added-at = {2012-09-01T13:08:21.000+0200},
author = {Foulger, G. R. and Julian, B. R. and Pitt, A. M. and Hill, D. P. and Malin, P. E. and Shalev, E.},
biburl = {https://www.bibsonomy.org/bibtex/29a1eaa177cc5ded7a4121f1039dc2ea5/nilsma},
day = 12,
doi = {10.1029/2000JB000041},
interhash = {bdc146b91b037e892dd92120711b8645},
intrahash = {9a1eaa177cc5ded7a4121f1039dc2ea5},
issn = {0148-0227},
journal = {Journal of Geophysical Research},
keywords = {geophysics seismology},
month = mar,
number = {B3},
pages = 2147,
timestamp = {2021-02-09T13:26:58.000+0100},
title = {Three-dimensional crustal structure of Long Valley caldera, California,
and evidence for the migration of CO2 under Mammoth Mountain},
url = {http://dx.doi.org/10.1029/2000JB000041},
volume = 108,
year = 2003
}