Temporal variations of non-volcanic tremor NVT locations in the Mexican subduction zone: Finding the NVT sweet spot.Report as inadecuate




Temporal variations of non-volcanic tremor NVT locations in the Mexican subduction zone: Finding the NVT sweet spot. - Download this document for free, or read online. Document in PDF available to download.

1 Instituto de Geofísica 2 IG - Instituto de Geofísica 3 Departamento de Geofísica 4 Instituto de Geofísica, Departamento de Vulcanología 5 IPGP - Institut de Physique du Globe de Paris 6 ISTerre - Institut des Sciences de la Terre

Abstract : Epicentral locations of non-volcanic tremors NVT in the Mexican subduction zone are determined from the peak of the energy spatial distribution and examined over time. NVT is found to occur persistently at a distance of ∼215 km from the trench, which we term the -Sweet Spot- because this region probably has the proper conditions i.e., temperature, pressure, and fluid content for the NVT to occur with minimum shear slip. High-energy NVT episodes are also observed every few months, extending ∼190 km to ∼220 km from the trench with durations of a few weeks. During the 2006 slow slip event SSE the duration and the recurrence rate of the NVT episodes increased. Low-energy episodes were also observed, independent from the high-energy episodes, ∼150 km to ∼190 km from the trench during the 2006 SSE. Both the high and low energy episodes were made up of many individual NVT-s that had a range of energy-release-rates. However, the highest energy-release-rates of the high-energy episodes were consistently double those of the low-energy episodes and the persistent activity at the Sweet Spot. We suggest that all of the high-energy episodes are evidence of small, short repeat interval SSE. Given this model, the increased recurrence rate of the high-energy NVT episodes during the 2006 long-term SSE implies that short-term SSE-s also increase during the SSE and are therefore triggered by the SSE.





Author: Allen Husker - Vladimir Kostoglodov - Victor Cruz-Atienza - Denis Legrand - N.M. Shapiro - Juan S. Payero - Michel Campillo - Edu

Source: https://hal.archives-ouvertes.fr/



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