| Abstract: | Interferometric Synthetic Aperture Radar data spanning strong earth-quakes on the islands of Java and Hawai‘i in 2006 reveal patches of subsidence and incoherence indicative of localized ground failure. Interferograms spanning the 26 May 2006 Java earthquake suggest an area of about 7:5 km2 of subsidence (~2 cm) and incoherence south of the city of Yogyakarta that correlates with significant damage to housing, high modeled peak ground accelerations, and poorly consolidated geologic deposits. The subsidence and incoherence is inferred to be a result of intense shaking and/or damage. At least five subsidence patches on the west side of the Island of Hawai‘i, ranging 0:3-2:2 km2 in area and 3-8 cm in magnitude, occurred as a result of a pair of strong earthquakes on 15 October 2006. Although no felt reports or seismic data are available from the areas in Hawai‘i, the Java example suggests that the subsidence patches indicate areas of amplified earthquake shaking. Surprisingly, all subsidence areas in Hawai‘i were limited to recent, and supposedly stable, lava flows and may reflect geological conditions not detectable at the surface. In addition, two ‘a‘?? lava flows in Hawai‘i were partially incoherent in interferograms spanning the earthquakes, indicating surface disruption as a result of the earthquake shaking. Coearthquake incoherence of rubbly deposits, like ‘a‘?? flows, should be explored as a potential indicator of earthquake intensity and past strong seismic activity. |
| Genre: | Article |
| ProdID: | 70037223 |
| Citation Author: | Poland, M. |
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| Citation End Page: | 540 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Bulletin of the Seismological Society of America |
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| Citation Number Of Pages: | 9 |
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| Citation Search Results Text: | Localized surface disruptions observed by InSAR during strong earthquakes in Java and Hawai‘i; 2010; Article; Journal; Bulletin of the Seismological Society of America; Poland, M. |
| Citation Start Page: | 532 |
| Citation Volume: | 100 |
| Citation Year: | 2010 |
| Type: | citation/reference |
| Text: | Localized surface disruptions observed by InSAR during strong earthquakes in Java and Hawai‘i; 2010; Article; Journal; Bulletin of the Seismological Society of America; Poland, M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1785/0120090175 |
| Date Other: | Fri, 1 Jan 2010 00:00 -0600 |
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