NDLI: Shallow seismicity, triggered seismicity, and ambient noise tomography at the long-dormant Uturuncu Volcano, Bolivia

Content Provider	Springer Nature Link
Author	Jay, Jennifer A. Pritchard, Matthew E. West, Michael E. Christensen, Douglas Haney, Matthew Minaya, Estela Sunagua, Mayel McNutt, Stephen R. Zabala, Mario
Copyright Year	2011
Abstract	Using a network of 15 seismometers around the inflating Uturuncu Volcano from April 2009 to 2010, we find an average rate of about three local volcano-tectonic earthquakes per day, and swarms of 5–60 events a few times per month with local magnitudes ranging from −1.2 to 3.7. The earthquake depths are near sea level, more than 10 km above the geodetically inferred inflation source and the Altiplano Puna Magma Body. The Mw 8.8 Maule earthquake on 27 February 2010 triggered hundreds of earthquakes at Uturuncu with the onset of the Love and Rayleigh waves and again with the passage of the X2/X3 overtone phases of Rayleigh waves. This is one of the first incidences in which triggering has been observed from multiple surface wave trains. The earthquakes are oriented NW–SE similar to the regional faults and lineaments. The b value of the catalog is 0.49, consistent with a tectonic origin of the earthquakes. We perform ambient noise tomography using Love wave cross-correlations to image a low-velocity zone at 1.9 to 3.9 km depth below the surface centered slightly north of the summit. The low velocities are perhaps related to the hydrothermal system and the low-velocity zone is spatially correlated with earthquake locations. The earthquake rate appears to vary with time—a seismic deployment from 1996 to 1997 reveals 1–5 earthquakes per day, whereas 60 events/day were seen during 5 days using one seismometer in 2003. However, differences in analysis methods and magnitudes of completeness do not allow direct comparison of these seismicity rates. The rate of seismic activity at Uturuncu is higher than at other well-monitored inflating volcanoes during periods of repose. The frequent swarms and triggered earthquakes suggest the hydrothermal system is metastable.
Starting Page	817
Ending Page	837
Page Count	21
File Format	PDF
ISSN	02588900
Journal	Bulletin of Volcanology
Volume Number	74
Issue Number	4
e-ISSN	14320819
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-11-25
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Seismology Triggered earthquakes Earthquake swarms South America Geology Sedimentology Mineralogy Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology

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