| Abstract: | The Long Valley caldera (California) formed ???760,000 yr ago following the massive eruption of the Bishop Tuff. Postcaldera volcanism in the Long Valley volcanic fi eld includes lava domes as young as 650 yr. The recent geological unrest is characterized by uplift of the resurgent dome in the central section of the caldera (75 cm in the past 33 yr) and earthquake activity followed by periods of relative quiescence. Since the spring of 1998, the caldera has been in a state of low activity. The cause of unrest is still debated, and hypotheses range from hybrid sources (e.g., magma with a high percentage of volatiles) to hydrothermal fl uid intrusion. Here, we present observations of surface deformation in the Long Valley region based on differential synthetic aperture radar interferometry (InSAR), leveling, global positioning system (GPS), two-color electronic distance meter (EDM), and microgravity data. Thanks to the joint application of InSAR and microgravity data, we are able to unambiguously determine that magma is the cause of unrest. ?? 2009 The Geological Society of America. |
| Genre: | Article |
| ProdID: | 70036861 |
| Citation Author: | Tizzani, P.; Battaglia, M.; Zeni, G.; Atzori, S.; Berardino, P.; Lanari, R. |
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| Citation End Page: | 66 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geology |
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| Citation Number Of Pages: | 4 |
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| Citation Search Results Text: | Uplift and magma intrusion at Long Valley caldera from InSAR and gravity measurements; 2009; Article; Journal; Geology; Tizzani, P.; Battaglia, M.; Zeni, G.; Atzori, S.; Berardino, P.; Lanari, R. |
| Citation Start Page: | 63 |
| Citation Volume: | 37 |
| Citation Year: | 2009 |
| Type: | citation/reference |
| Text: | Uplift and magma intrusion at Long Valley caldera from InSAR and gravity measurements; 2009; Article; Journal; Geology; Tizzani, P.; Battaglia, M.; Zeni, G.; Atzori, S.; Berardino, P.; Lanari, R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1130/G25318A.1 |
| Date Other: | Thu, 1 Jan 2009 00:00 -0600 |
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