Celine Hadziioannou
2018-12-20 19:40:49
Dear colleagues,
we would like to draw your attention to our session:
*SM7.2 "Ambient seismic noise techniques: sources, monitoring, and imaging"*
https://meetingorganizer.copernicus.org/EGU2019/session/31897
The session will feature an invited talk by *Lise Retailleau* (Stanford,
USA).
Please inform your colleagues and students about this opportunity to
present their work. We look forward to your contributions!
best regards,
Celine Hadziioannou
Laura Ermert
Gregor Hillers
Anne Obermann
Christoph Sens-Schönfelder
*Important dates:*
Meeting: 7 - 12 April 2019
Abstract submission deadline: *10 January 2019 at 13:00 CET*
*Session Description*
Ambient seismic noise, once regarded as a nuisance, is now a core part
of the seismological toolkit. Tomographic images are constructed from
surface waves within small arrays and on the continental scale.
Reflected waves are recovered from cross- and autocorrelations of the
ambient field at local and teleseismic distances. Temporal variations of
wave velocities and impedance structure are observed in the very shallow
subsurface and at significant depth and led to the discovery of dynamic
processes in the subsurface with relevance for earthquake triggering and
relaxation, volcano and landslide dynamics as well as for the production
from hydrocarbon reservoirs and geothermal fields. Established
techniques are now routinely applied but new types of applications and
continuing developments of new processing strategies constantly extend
the capabilities of the noise based techniques. In addition, there are
many unknowns related to the distributed and temporally variable sources
of ambient vibrations. This variability affects the stability of seismic
‘noise correlation’ signals which leads to uncertainties in the seismic
images and complicated time-lapse observations.
In this session, we focus on open questions and methodological advances
in seismic interferometry and ambient noise based seismology. We invite
(A) contributions on new methodological approaches in seismic
interferometry and noise processing (B) studies of time variations of
elastic material properties and (C) investigations of the sources of the
ambient seismic noise.
This extends to evaluations of the accuracy of noise-based measurements
for use in tomography or time-dependent imaging. It includes theoretical
advances, such as the use of deconvolution or those exploring the role
of source distribution or scattering, as well as methodological
improvements and alternative processing techniques aimed at enhancing
the quality of the correlations. Understanding the noise generation
processes (microseisms, hum, microbaroms, etc) and causes of temporal
variations of the noise field and the medium properties (dynamic and
static stress changes, hydrology, etc.), and their effects on noise
correlations is of fundamental interest in this context.
--
-----------------------------------------------------
Dr. Céline Hadziioannou
University of Hamburg
Institute of Geophysics
Bundesstrasse 55
20146 Hamburg -- Germany
Tel. +49 (0)40 42838 2980
Mail: celine.hadziioannou<at>uni-hamburg.de
<celine.hadziioannou<at>uni-hamburg.de>
Web : http://celine.hadzii.com
-----------------------------------------------------
we would like to draw your attention to our session:
*SM7.2 "Ambient seismic noise techniques: sources, monitoring, and imaging"*
https://meetingorganizer.copernicus.org/EGU2019/session/31897
The session will feature an invited talk by *Lise Retailleau* (Stanford,
USA).
Please inform your colleagues and students about this opportunity to
present their work. We look forward to your contributions!
best regards,
Celine Hadziioannou
Laura Ermert
Gregor Hillers
Anne Obermann
Christoph Sens-Schönfelder
*Important dates:*
Meeting: 7 - 12 April 2019
Abstract submission deadline: *10 January 2019 at 13:00 CET*
*Session Description*
Ambient seismic noise, once regarded as a nuisance, is now a core part
of the seismological toolkit. Tomographic images are constructed from
surface waves within small arrays and on the continental scale.
Reflected waves are recovered from cross- and autocorrelations of the
ambient field at local and teleseismic distances. Temporal variations of
wave velocities and impedance structure are observed in the very shallow
subsurface and at significant depth and led to the discovery of dynamic
processes in the subsurface with relevance for earthquake triggering and
relaxation, volcano and landslide dynamics as well as for the production
from hydrocarbon reservoirs and geothermal fields. Established
techniques are now routinely applied but new types of applications and
continuing developments of new processing strategies constantly extend
the capabilities of the noise based techniques. In addition, there are
many unknowns related to the distributed and temporally variable sources
of ambient vibrations. This variability affects the stability of seismic
‘noise correlation’ signals which leads to uncertainties in the seismic
images and complicated time-lapse observations.
In this session, we focus on open questions and methodological advances
in seismic interferometry and ambient noise based seismology. We invite
(A) contributions on new methodological approaches in seismic
interferometry and noise processing (B) studies of time variations of
elastic material properties and (C) investigations of the sources of the
ambient seismic noise.
This extends to evaluations of the accuracy of noise-based measurements
for use in tomography or time-dependent imaging. It includes theoretical
advances, such as the use of deconvolution or those exploring the role
of source distribution or scattering, as well as methodological
improvements and alternative processing techniques aimed at enhancing
the quality of the correlations. Understanding the noise generation
processes (microseisms, hum, microbaroms, etc) and causes of temporal
variations of the noise field and the medium properties (dynamic and
static stress changes, hydrology, etc.), and their effects on noise
correlations is of fundamental interest in this context.
--
-----------------------------------------------------
Dr. Céline Hadziioannou
University of Hamburg
Institute of Geophysics
Bundesstrasse 55
20146 Hamburg -- Germany
Tel. +49 (0)40 42838 2980
Mail: celine.hadziioannou<at>uni-hamburg.de
<celine.hadziioannou<at>uni-hamburg.de>
Web : http://celine.hadzii.com
-----------------------------------------------------
