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Near real-time monitoring of volcanic surface deformation from GPS measurements at Long Valley Caldera, California

Geophysical Research Letters

By:
, , and
DOI: 10.1002/grl.50258

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Abstract

Long Valley Caldera in eastern California is an active volcanic area and has shown continued unrest in the last three decades. We have monitored surface deformation from Global Positioning System (GPS) data by using a projection method that we call Targeted Projection Operator (TPO). TPO projects residual time series with secular rates and periodic terms removed onto a predefined spatial pattern. We used the 2009–2010 slow deflation as a target spatial pattern. The resulting TPO time series shows a detailed deformation history including the 2007–2009 inflation, the 2009–2010 deflation, and a recent inflation that started in late-2011 and is continuing at the present time (November 2012). The recent inflation event is about four times faster than the previous 2007–2009 event. A Mogi source of the recent event is located beneath the resurgent dome at about 6.6 km depth at a rate of 0.009 km3/yr volume change. TPO is simple and fast and can provide a near real-time continuous monitoring tool without directly looking at all the data from many GPS sites in this potentially eruptive volcanic system.

Geospatial Extents

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Near real-time monitoring of volcanic surface deformation from GPS measurements at Long Valley Caldera, California
Series title:
Geophysical Research Letters
DOI:
10.1002/grl.50258
Volume
40
Issue:
6
Year Published:
2013
Language:
English
Publisher:
Wiley
Contributing office(s):
Earthquake Science Center
Description:
5 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geophysical Research Letters
First page:
1054
Last page:
1058
Country:
United States
State:
California
Other Geospatial:
Long Valley Caldera