[IRIS] AGU 2006 Fall Meeting: Rotational Motions in Seismology

[IRIS]

There will be a session on rotational motions in seismology at the  
coming American Geophysical Union (AGU) Fall Meeting in San  
Francisco, 11–15 December, 2006. A description of this session is  
given below.

If you are working on rotational motions, we would like to invite you  
to submit an abstract to this AGU session. Please note that the  
deadline for abstract submission to AGU is: September 7, 2006.

S05: Rotational Motions in Seismology

Seismology is based primarily on the observation and modelling of  
three-component translational ground motions. Nevertheless,  
theoretical seismologists (e.g., Aki and Richards, 1980, 2002) have  
argued for decades that the rotational part of ground motions should  
also be recorded.

It is well known that standard seismometers are sensitive to  
rotations (just like tiltmeters are sensitive to translations). The  
lack of observations of rotational motions was mainly due to the  
limited resolution of rotation sensors.

However, in the past few years ring lasers, fibre-optic gyros, and  
other measurement devices have led to the first significant and  
consistent observations of rotational motions suggesting that  
complete six-component measurements may be possible in the near future.

Accurate measurements of rotational motions may have implications for  
(1) recovering the complete displacement history from seismometer  
recordings; (2) further constraining rupture properties; (3)  
extracting subsurface properties; and (4) providing additional  
information to earthquake engineers. The goal of this session is to  
discuss measurement devices, observations, modelling, theoretical  
aspects and potential applications of rotational ground motions.

The session will be accompanied by the installation of an  
International Working Group on Rotational Seismology that aims at  
promoting investigations of all aspects of rotational motions in  
seismology and their implications for related fields such as  
earthquake engineering, geodesy, strong-motion seismology, tectonics,  
etc., and to share experience, data, software, and results in an open  
web-based environment. Further information can be found at  
www.rotational-seismology.org.

Please note that this website is now under construction. A FTP  
website had been set up by John Evans at:  ftp://ehzftp.wr.usgs.gov/ 
jrevans/RotationsWorkshop/
During the transition period, please also visit this FTP website.

Conveners:
Heiner Igel
University of Munich, Germany
<igel at geophysik.uni-muenchen.de>

William H.K. Lee
USGS, USA
<lee at usgs.gov>

Maria Todorovska
University of Southern California, USA
<mtodorov at usc.edu>
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