HR: 15:10h
AN: T53C-07    [Abstracts]
TI: Simultaneous ELF Magnetic Field Monitoring of Earthquakes from a Nano-satellite (QuakeSat) and a Ground Network
AU: * Bleier, T E
EM: tbleier@quakefinder.com
AF: QuakeFinder, LLC, 250 Cambridge Ave Suite 204, Palo Alto, Ca 94306 United States
AU: Dunson, C
EM: cdunson@quakefinder.com
AF: QuakeFinder, LLC, 250 Cambridge Ave Suite 204, Palo Alto, Ca 94306 United States
AB: On June 30 2004, QuakeFinder LLC, in collaboration with Stanford University and Lockheed Martin, launched a 4.5 kg nanosatellite called QuakeSat into an 840 km circular, sun-synch orbit. In addition to the student teaching goals, the satellite was a prototype for a research satellite to study whether Extremely-Low-Frequency (ELF) magnetic field disturbances occurred before or after large earthquakes. The frequency response for QuakeSat's single-axis search coil magnetometer and ELF receiver was 1-1000 Hz in 4 bands. The overall mission also had a ground component, namely a network of 35 three-axis magnetometer sensors, deployed every 30 km along major faults (e.g. San Andreas) in California. The frequency response of these ELF receivers was 0.1 to 4 Hz. and they had a 10km range. Both the space and ground-based systems were designed to record raw, time series data, and the objectives were not only to determine if earthquake-generated ELF signals exist, but to characterize them in both time and frequency and to distinguish them from the many other magnetic signals present in space and near the ground. This paper addresses a case study of the Dec. 22 2004, M6.4 San Simeon earthquake in California, and compares both space and ground ELF signatures. Preliminary results of the satellite collections showed unique signals prior to and after the San Simeon quake, as well as several other large world-wide quakes. Ground collections were inconclusive since the 4 closest of the 35 sensors were more than 60 km and 2 parallel fault traces from the epicenter.
UR: http://www.quakefinder.com
DE: 2487 Wave propagation (6934)
DE: 0619 Electromagnetic theory
DE: 0689 Wave propagation (4275)
DE: 0694 Instrumentation and techniques
SC: Tectonophysics [T]
MN: 2004 AGU Fall Meeting