[SIO GP Seminars] GP-seminar: Greg Anderson, PBO project report

[Matt Wei]

Please join us Friday, Jan. 12th, for the first GP Seminar of 2007.

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FRIDAY, Jan. 12, 3:00 PM
(refreshments served at 2:45 PM)
Munk Conference Room

Greg Anderson
UNAVCO, IGPP Alumni

Halfway Through: PBO Progress and Highlights

=====================

UNAVCO is building and operating the Plate Boundary Observatory  
(PBO), part of
the NSF-funded EarthScope project to understand the structure,  
dynamics, and
evolution of the North American continent.  When complete in October  
2008, the
875-station PBO GPS, 108 strain and seismic, and 28 tiltmeter  
stations will
comprise the largest integrated geodetic and seismic network in  
United States
and the second largest in the world.  Data from the PBO network will  
facilitate
research into plate boundary deformation with unprecedented scope and  
detail.

As of 1 January 2007, UNAVCO had completed 510 GPS stations, 26 borehole
strainmeters and seismometers, and 4 borehole tiltmeters.  In  
addition, 135 of
209 previously existing GPS stations have been incorporated into PBO  
through
the PBO Nucleus project, and UCSD has built 3 of 5 planned long- 
baseline laser
strainmeters.   UNAVCO provides regular construction progress updates  
and
continuously updated network status information from the PBO web  
pages at
http://pboweb.unavco.org.

The combined network has provided 336 GB of raw data to date,  
approximately
half of which is GPS data from the PBO network.  UNAVCO and UNAVCO  
contractors
process these raw data into a wide variety of higher-level derived  
products,
including time series of raw and corrected strain, GPS station  
position, GPS
station velocities, and coseismic offsets for significant  
earthquakes.  All PBO
data products are freely available to the community without  
artificial delay
and can be accessed from these data products from the PBO web pages at
http://pboweb.unavco.org/gps_data and http://pboweb.unavco.org/ 
strain_data.

The scientific payoffs from the EarthScope project have begun as the  
community
has started using EarthScope data in earnest.  Scientific highlights  
from PBO
to date include capture of the pre-eruptive, eruptive, and post- 
eruptive phases
of activity at Augustine Volcano, Alaska, during 2005 and 2006; dense  
coverage
of the ongoing volcanic unrest at Mt. St.  Helens; recording of large
earthquakes near Cape Mendocino in northern California, in Parkfield,  
Russia,
Tonga, and the Kuril Islands; and recording of the 2005 episodic  
tremor and
slip event along the Cascadia subduction zone.  More controversial  
results
include possible recording of episodic tremor and slip late in 2006  
and a
possible transient slip event along the subduction interface near  
Anchorage,
Alaska.


Have a good day.

Matt

==========================================
Meng Wei ( Matt )
Institute of Geophysics and Planetary Physics
Scripps Institution of Oceanography
University of California, San Diego
La Jolla, CA 92093-0225
mwei at ucsd.edu
(858) 822-4347
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