HR: 0800h
AN: S41A-0247    [Abstracts]
TI: UNAVCO-PBO Strainmeters on Mt. Saint Helens: The What, Where, When, and Why of a Strainmeter Array.
AU: * Johnson, W C
EM: johnson@unavco.org
AF: UNAVCO, 6350 Nautilus Dr, Boulder, CO 80301,
AU: VanBoskirk, E
EM: vanboskirk@unavco.org
AF: UNAVCO, 6350 Nautilus Dr, Boulder, CO 80301,
AU: Hodgkinson, K
EM: hodgkinson@unavco.org
AF: UNAVCO, 6350 Nautilus Dr, Boulder, CO 80301,
AU: Mencin, D
EM: mencin@unavco.org
AF: UNAVCO, 6350 Nautilus Dr, Boulder, CO 80301,
AU: Dittman, T
EM: dittmann@unavco.org
AF: UNAVCO, 6350 Nautilus Dr, Boulder, CO 80301,
AU: Venator, S
EM: venator@unavco.org
AF: UNAVCO, 6350 Nautilus Dr, Boulder, CO 80301,
AU: Tiedeman, A
EM: Tiedeman
AF: UNAVCO, 6350 Nautilus Dr, Boulder, CO 80301,
AU: Gottlieb, M
EM: gottlieb@unavco.org
AF: UNAVCO, 6350 Nautilus Dr, Boulder, CO 80301,
AU: Stair, J
EM: stair@unavco.org
AF: UNAVCO, 6350 Nautilus Dr, Boulder, CO 80301,
AU: Alm, S
EM: Alm@unavco.org
AF: UNAVCO, 6350 Nautilus Dr, Boulder, CO 80301,
AB: In the summer of 2007 UNAVCO installed four Gladwin bore hole strainmeters and seismometers for the purpose of observing Mt. Saint Helens geophysical processes. The strainmeters are co-located with tiltmeters and near continuously operating PBO GPS sites. When combined the data sets will record the time-dependent three-dimensional deformation field at the volcano and has the capability of capturing strain transients on the periods of hours to months. This array will be used as a case study of how UNAVCO strainmeters are located for volcanic monitoring and observation as well to give a general idea of how a strainmeter array is selected. What are criteria used to select an array? Where are the ideal locations for a site within array? Why is the array important? The model for the array emplaced on Mt St Helens can be transferred to other volcanic setting, such as Yellowstone. This array will provide long-term (20+ year) data with little maintenance and access to the data through UNAVCO the IRIS DMC and the NCEDC. This array is an excellent example of the power of borehole strainmeters and the suite of instruments that accompany it in understanding geophysical processes.
DE: 7294 Seismic instruments and networks (0935, 3025)
DE: 8178 Tectonics and magmatism
DE: 8494 Instruments and techniques
SC: Seismology [S]
MN: 2007 Fall Meeting