[unav_all] IRIS Webinar 4/24 - Seismic interferometry and tomography: from shallow to deep

Andy Frassetto andyf at iris.edu
Wed Apr 17 15:20:43 MDT 2013


The next IRIS webinar, sponsored by its USArray Transportable Array 
working group, will present "Seismic interferometry and tomography: from 
shallow to deep" on April 24th from 2-3 pm ET (6-7 pm UTC).

Register to attend: https://www2.gotomeeting.com/register/602417842. You 
will be emailed a confirmation containing a link for accessing the 
webinar. The presentation and subsequent interactions between the 
speaker, host, and audience are recorded and made available within a few 
days. Access to the webinar archive, along with related materials and 
more information on the series is found here: 
http://www.iris.edu/hq/webinar/

Presenter: Fan-Chi Lin, California Institute for Technology

Summary: Seismic waves propagating through the earth's interior are 
important tools to study earth structure. Recently, large-scale seismic 
array deployments have promoted the development of new data analysis 
methods. Surface-wave tomography, which uses surface waves to determine 
crustal and upper mantle structure, and seismic interferometry, which 
extracts waves traveling between two stations by cross-correlating long 
duration noise signals, are among the many exciting research areas. In 
this presentation, I will demonstrate how high-resolution surface-wave 
phase velocity, amplification, and ellipticity maps can be determined 
based on array analysis and used to constrain crust and upper mantle 
velocity, anisotropy, attenuation, and density structure. Moreover, I 
will show how both surface waves and deep-propagating body waves, 
particularly core phases, can be extracted from seismic noise based on 
seismic interferometry. The application of seismic tomography and 
interferometry using USArray and various other regional arrays will be 
discussed, which reveals detailed earth structure that can be associated 
with surface geological features, plate tectonics, and core formation.

Andy Frassetto (andyf at iris.edu) can be contacted with any inquiries.

System Requirements
PC-based attendees
Required: Windows® 7, 8, Vista, XP or 2003 Server
Macintosh®-based attendees
Required: Mac OS® X 10.5 or newer


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