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U N A V C O , A N O N - P R O F I T M E M B E R S H I P - G O V E R N E D C O N S O R T I U M , F A C I L I T A T E S G E O S C I E N C E R E S E A R C H A N D E D U C A T I O N U S I N G G E O D E S Y.
The PBO consists of several major observatory components: a network of 1100 permanent, continuously operating Global Positioning System (GPS) stations many of which provide data at high-rate and in real-time, 78 borehole seismometers, 74 borehole strainmeters, 26 shallow borehole tiltmeters, and six long baseline laser strainmeters. These instruments are complemented by InSAR (interferometric synthetic aperture radar) and LiDAR (light detection and ranging) imagery and geochronology acquired as part of the GeoEarthScope initiative. PBO also includes comprehensive data products, data management and education and outreach efforts.
As part of the PBO-NSF Cooperative Agreement UNAVCO manages the EarthScope San Andreas Fault Observatory at Depth (SAFOD) including monitoring major subawards, equipment refurbishment, core sampling and distribution, and community oversight. SAFOD management was based at Stanford University and at the USGS during the MREFC construction phase. + More
The ability of PBO to address its scientific goals relies heavily on long-term and continuous instrument operation to obtain uninterrupted time series of positions and strains, which are critical for rigorously quantifying measurement errors and detecting secular and transient deformation. PBO spans the North American continent with instrumentation, providing the detailed deformation data necessary to address a wide range of scientific goals at the forefront of tectonics and earthquake science, including the modes and driving forces of distributed plate boundary deformation, time-dependent deformation and rheology of the lithosphere, and episodic tremor and slip (ETS) phenomena.
The PBO Major Research and Equipment Facilities Construction (MREFC) was completed on time and on budget in October 2008. PBO is now in an operations and maintenance phase with a primary focus of maintaining a high level of station uptime and high-quality data and data products that are freely and openly available to the public with equal access provided for all users.
In October 2011, engineers from the Plate Boundary Observatory began work on an NSF-funded RAPID project related to the study of the post-rupture crustal relaxation due to the M5.8 earthquake that struck near Mineral, VA on August 23, 2011. The project consisted of the reconnaissance, permitting, construction, and data communications for two permanent GPS stations near Louisa, Virginia, close to the epicenter of the earthquake. UNAVCO field engineers assisted the Principal Investigator with all the components of the fieldwork. The project was completed in November 2011.
Beginning October 2011, UNAVCO will start releasing high-rate (1-sps) processed borehole strainmeter data for geophysical events of special interest, e.g., earthquakes, tsunamis, volcanic events or in response to community requests. The high rate strain data set will include areal and shear strain, earth tide plus ocean load time-series, barometric pressure corrections, plus pore pressure and tiltmeter data if they are collected at the site. These new data products will be available from the UNAVCO PBO web page under the Geophysical Event section. The first high rate data sets available are for the M9, March 11, 2011, Tohoku Earthquake and the M6.4, 2011 September 9, Vancouver Island Earthquake.
UNAVCO has released a new realization of the Plate Boundary Observatory (PBO) network GPS velocity field, reflecting data acquired through May 2011.
A few months earlier than anticipated, the 2011 Cascadia Episodic Tremor and Slip event may be underway. Based on the start time of last year's event, this year's tremor was expected to begin late October 2011. An increase in tremor south of Puget Sound around August 7th, however, and its propagation northeastwards under the Olympic Peninsula over the past 10 days has caused speculation that this is the main 2011 ETS event (http://www.pnsn.org/WEBICORDER/DEEPTREM/summer2011.html).
The Plate Boundary Observatory (PBO) worked hard in the fall of 2010 to install instrumentation in deep boreholes in the San Jacinto Fault area of southern. The area of focus was in the region of the town of Anza, located roughly halfway between the Salton Sea and the city of Riverside, California.
Geophysical Event Data
|Multiple Stations (P406,P407,P499)||Station Type|
|Single Station Code (example: P406)||Select A Station|
PBO Data Access