HR: 1340h
AN: G13B-1223    [Abstracts]
TI: Integration of the Plate Boundary Observatory and Existing GPS Networks in Southern California: A Multi Use Geodetic Network
AU: * Walls, C
EM: walls@unavco.org
AF: UNAVCO, 6350 Nautilus Drive, Boulder, CO 80301,
AU: Blume, F
EM: blume@unavco.org
AF: UNAVCO, 6350 Nautilus Drive, Boulder, CO 80301,
AU: Meertens, C
EM: meertens@unavco.org
AF: UNAVCO, 6350 Nautilus Drive, Boulder, CO 80301,
AU: Arnitz, E
EM: arnitz@unavco.org
AF: UNAVCO, 6350 Nautilus Drive, Boulder, CO 80301,
AU: Lawrence, S
EM: lawrence@unavco.org
AF: UNAVCO, 6350 Nautilus Drive, Boulder, CO 80301,
AU: Miller, S
EM: miller@unavco.org
AF: UNAVCO, 6350 Nautilus Drive, Boulder, CO 80301,
AU: Bradley, W
EM: bwilson@unavco.org
AF: UNAVCO, 6350 Nautilus Drive, Boulder, CO 80301,
AU: Jackson, M
EM: jackson@unavco.org
AF: UNAVCO, 6350 Nautilus Drive, Boulder, CO 80301,
AU: Feaux, K
EM: feaux@unavco.org
AF: UNAVCO, 6350 Nautilus Drive, Boulder, CO 80301,
AB: The ultra-stable GPS monument design developed by Southern California Geodetic Network (SCIGN) in the late 1990s demonstrates sub-millimeter errors on long time series where there are a high percentage of observations and low multipath. Following SCIGN, other networks such as PANGA and BARGEN have adopted the monument design for both deep drilled braced monuments (DDBM = 5 legs grouted 10.7 meters into bedrock/stratigraphy) and short drilled braced monuments (SDBM = 4 legs epoxied 2 meters into bedrock). A Plate Boundary Observatory (PBO) GPS station consists of a "SCIGN" style monument and state of the art NetRS receiver and IP based communications. Between the years 2003-2008 875 permanent PBO GPS stations are being built throughout the United States. Concomitant with construction of the PBO the majority of pre-existing GPS stations that meet stability specifications are being upgraded with Trimble NetRS and IP based communications to PBO standards under the EarthScope PBO Nucleus project. In 2008, with completed construction of the Plate Boundary Observatory, more than 1100 GPS stations will share common design specifications and have identical receivers with common communications making it the most homogenous geodetic network in the World. Of the 875 total Plate Boundary Observatory GPS stations, 211 proposed sites are distributed throughout the Southern California region. As of August 2007 the production status is: 174 stations built (81 short braced monuments, 93 deep drilled braced monuments), 181 permits signed, 211 permits submitted and 211 station reconnaissance reports. The balance of 37 stations (19 SDBM and 18 DDBM) will be built over the next year from Long Valley to the Mexico border in order of priority as recommended by the PBO Transform, Extension and Magmatic working groups. Fifteen second data is archived for each station and 1 Hz as well as 5 Hz data is buffered to be triggered for download in the event of an earthquake. Communications equipment includes CDMA Proxicast modems, Hughes Vsat, Intuicom 900 MHz Ethernet bridge radios and several "real-time" sites use 2.4 GHz Wilan radios. Ultimately, 125 of the existing former-SCIGN GPS stations will be integrated into the So Cal region of PBO, of which 25 have real-time data streams. At the time of this publication the total combined Southern California region has over 40 stations streaming real-time data using both radios and CDMA modems. The real-time GPS sites provide specific benefits beyond the standard GPS station: they can provide a live correction for local surveyors and can be used to trigger an alarm if large displacements are recorded. The cross fault spatial distribution of these 336 GPS stations in the seismically active southern California region has the grand potential of augmenting a strong motion earthquake early warning system.
DE: 1209 Tectonic deformation (6924)
SC: Geodesy [G]
MN: 2007 Fall Meeting