Satellite radar interferometry measures deformation at Okmok Volcano
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Abstract
The center of the Okmok caldera in Alaska subsided 140 cm as a result of its February– April 1997 eruption, according to satellite data from ERS-1 and ERS-2 synthetic aperture radar (SAR) interferometry. The inferred deflationary source was located 2.7 km beneath the approximate center of the caldera using a point source deflation model. Researchers believe this source is a magma chamber about 5 km from the eruptive source vent. During the 3 years before the eruption, the center of the caldera uplifted by about 23 cm, which researchers believe was a pre-emptive inflation of the magma chamber. Scientists say such measurements demonstrate that radar interferometry is a promising spaceborne technique for monitoring remote volcanoes. Frequent, routine acquisition of images with SAR interferometry could make near realtime monitoring at such volcanoes the rule, aiding in eruption forecasting.
Publication type | Article |
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Publication Subtype | Journal Article |
Title | Satellite radar interferometry measures deformation at Okmok Volcano |
Series title | Eos, Transactions, American Geophysical Union |
DOI | 10.1029/98EO00348 |
Volume | 79 |
Issue | 39 |
Year Published | 1998 |
Language | English |
Publisher | American Geophysical Union |
Contributing office(s) | Earth Resources Observation and Science (EROS) Center |
Description | 8 p. |
First page | 461 |
Last page | 468 |
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