HR: 1340h
AN: V53A-1136 [Abstracts]
TI: Vector Deformation Maps of the Father's Day Intrusion at Kilauea: Constraints on Magma Injection
AU: * Sandwell, D
EM: dsandwell@ucsd.edu
AF: Scripps Institution of Oceanography, 1102 IGPP, La Jolla, CA 92093-0225, United States
AU: Myer, D
EM: dmyer@ucsd.edu
AF: Scripps Institution of Oceanography, 1102 IGPP, La Jolla, CA 92093-0225, United States
AU: Shimada, M
EM: shimada.masanobu@jaxa.jp
AF: ALOS Science project, JAXA/EORC, Sengen 2-1-1, Tsukuba, Iba 305-8505, Japan
AU: Brooks, B
EM: bbrooks@soest.hawaii.edu
AF: Hawaii Institute of Geophysics and Planetology, 1680 East-West Rd., Honolulu, HI 96822,
United States
AU: Foster, J
EM: jfoster@soest.hawaii.edu
AF: Hawaii Institute of Geophysics and Planetology, 1680 East-West Rd., Honolulu, HI 96822,
United States
AB:
Between June 17 and June 20, 2007, the East Rift of Kilauea Volcano opened more than 1.9 meters. Here we
report on two interferograms - ascending and descending - that were collected by the L-band synthetic aperture
radar aboard the ALOS spacecraft that is operated by the Japanese Space Agency - JAXA. We find that the L-
band interferograms retain coherence better than interferograms made from C-band instruments. The
interferometric phase is completely unwrapped with a single seed point. In addition to the two line-of-sight (LOS)
components, a third component (azimuthal offsets) can be derived from the reference and repeat images. These
three components are nearly orthogonal and thus provide the full vector displacement for this event.
Comparisons with continuous GPS data show that the two LOS components have rms precisions of 2.8 cm while
the third azimuth component has an rms precision of 5.8 cm. This third component reveals a peak surface
separation across the rift zone of 1.86 m, which is not fully captured (0.90 m) by the widely-spaced GPS
measurements. These near-field InSAR data will be used, together with the more precise far-field GPS
measurements, to constrain the models of dike opening and caldera deflation associated with this event. ALOS
continues to monitor Kilauea with new acquisitions approximately every 23 days.
UR: http://topex.ucsd.edu/kilauea
DE: 1207 Transient deformation (6924, 7230, 7240)
DE: 8434 Magma migration and fragmentation
DE: 8485 Remote sensing of volcanoes
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2007 Fall Meeting