Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/6864
AuthorsTizzani, P.* 
Battaglia, M.* 
Zeni, G.* 
Atzori, S.* 
Berardino, P.* 
Lanari, R.* 
TitleUplift and magma intrusion at Long Valley caldera from InSAR and gravity measurements
Issue Date2009
Series/Report no./37 (2009)
DOI10.1130/G25318A.1
URIhttp://hdl.handle.net/2122/6864
KeywordsInsar modelling
Volcano monitoring
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk 
AbstractThe 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.
Appears in Collections:Papers Published / Papers in press

Files in This Item:
File Description SizeFormat 
Tizzani et al 2009 (Long Valley) - Geology.pdf2.29 MBAdobe PDFView/Open
Show full item record

Page view(s)

69
Last Week
0
Last month
checked on Jun 23, 2017

Download(s)

23
checked on Jun 23, 2017

Google ScholarTM

Check

Altmetric