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Title: Magma intrusion near Volcan Tancitaro: Evidence from seismic analysis

Between May and June 2006, an earthquake swarm occurred near Volcan Tancítaro in Mexico, which was recorded by a temporary seismic deployment known as the MARS network. We located ~1000 events from this seismic swarm. Previous earthquake swarms in the area were reported in the years 1997, 1999 and 2000. We relocate and analyze the evolution and properties of the 2006 earthquake swarm, employing a waveform cross-correlation-based phase repicking technique. Hypocenters from 911 events were located and divided into eighteen families having a correlation coefficient at or above 0.75. 90% of the earthquakes provide at least sixteen phase picks. We used the single-event location code Hypo71 and the P-wave velocity model used by the Jalisco Seismic and Accelerometer Network to improve hypocenters based on the correlation-adjusted phase arrival times. We relocated 121 earthquakes, which show clearly two clusters, between 9–10 km and 3–4 km depth respectively. The average location error estimates are <1 km epicentrally, and <2 km in depth, for the largest event in each cluster. Depths of seismicity migrate upward from 16 to 3.5 km and exhibit a NE-SW trend. The swarm first migrated toward Paricutin Volcano but by mid-June began propagating back toward Volcán Tancítaro. In additionmore » to its persistence, noteworthy aspects of this swarm include a quasi-exponential increase in the rate of activity within the first 15 days; a b-value of 1.47; a jug-shaped hypocenter distribution; a shoaling rate of ~5 km/month within the deeper cluster, and a composite focal mechanism solution indicating largely reverse faulting. As a result, these features of the swarm suggest a magmatic source elevating the crustal strain beneath Volcan Tancítaro.« less
Authors:
 [1] ;  [1] ;  [2]
  1. Univ. de Guadalajara, Puerto Vallarta (Mexico)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-15-27784
Journal ID: ISSN 0031-9201
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Physics of the Earth and Planetary Interiors
Additional Journal Information:
Journal Name: Physics of the Earth and Planetary Interiors; Journal ID: ISSN 0031-9201
Publisher:
Elsevier
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Planetary Sciences; Volcano, microearthquakes, cross-correlation, magma intrusion, Mexico
OSTI Identifier:
1334143

Pinzon, Juan I., Nunez-Cornu, Francisco J., and Rowe, Charlotte Anne. Magma intrusion near Volcan Tancitaro: Evidence from seismic analysis. United States: N. p., Web. doi:10.1016/j.pepi.2016.11.004.
Pinzon, Juan I., Nunez-Cornu, Francisco J., & Rowe, Charlotte Anne. Magma intrusion near Volcan Tancitaro: Evidence from seismic analysis. United States. doi:10.1016/j.pepi.2016.11.004.
Pinzon, Juan I., Nunez-Cornu, Francisco J., and Rowe, Charlotte Anne. 2016. "Magma intrusion near Volcan Tancitaro: Evidence from seismic analysis". United States. doi:10.1016/j.pepi.2016.11.004. https://www.osti.gov/servlets/purl/1334143.
@article{osti_1334143,
title = {Magma intrusion near Volcan Tancitaro: Evidence from seismic analysis},
author = {Pinzon, Juan I. and Nunez-Cornu, Francisco J. and Rowe, Charlotte Anne},
abstractNote = {Between May and June 2006, an earthquake swarm occurred near Volcan Tancítaro in Mexico, which was recorded by a temporary seismic deployment known as the MARS network. We located ~1000 events from this seismic swarm. Previous earthquake swarms in the area were reported in the years 1997, 1999 and 2000. We relocate and analyze the evolution and properties of the 2006 earthquake swarm, employing a waveform cross-correlation-based phase repicking technique. Hypocenters from 911 events were located and divided into eighteen families having a correlation coefficient at or above 0.75. 90% of the earthquakes provide at least sixteen phase picks. We used the single-event location code Hypo71 and the P-wave velocity model used by the Jalisco Seismic and Accelerometer Network to improve hypocenters based on the correlation-adjusted phase arrival times. We relocated 121 earthquakes, which show clearly two clusters, between 9–10 km and 3–4 km depth respectively. The average location error estimates are <1 km epicentrally, and <2 km in depth, for the largest event in each cluster. Depths of seismicity migrate upward from 16 to 3.5 km and exhibit a NE-SW trend. The swarm first migrated toward Paricutin Volcano but by mid-June began propagating back toward Volcán Tancítaro. In addition to its persistence, noteworthy aspects of this swarm include a quasi-exponential increase in the rate of activity within the first 15 days; a b-value of 1.47; a jug-shaped hypocenter distribution; a shoaling rate of ~5 km/month within the deeper cluster, and a composite focal mechanism solution indicating largely reverse faulting. As a result, these features of the swarm suggest a magmatic source elevating the crustal strain beneath Volcan Tancítaro.},
doi = {10.1016/j.pepi.2016.11.004},
journal = {Physics of the Earth and Planetary Interiors},
number = ,
volume = ,
place = {United States},
year = {2016},
month = {11}
}