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Characteristic Tectonic Tremor Activity Observed Over Multiple Slow Slip Cycles in the Mexican Subduction Zone

Husker, Allen and Frank, William B. and Gonzalez, Guillermo and Avila, Leticia and Kostoglodov, Vladimir and Kazachkina, Ekaterina (2019) Characteristic Tectonic Tremor Activity Observed Over Multiple Slow Slip Cycles in the Mexican Subduction Zone. Journal of Geophysical Research. Solid Earth, 124 (1). pp. 599-608. ISSN 2169-9313. doi:10.1029/2018JB016517.

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We develop a single‐station tremor spectrum template detection method that we applied to continuous seismic data recorded by the Mexican National Seismological Service broadband stations. This allows for an unprecedented long‐term analysis of tectonic tremor in Mexico over multiple slow slip events (SSEs). We only detect tremor that are within previously discovered tremor regions, thereby extending the catalog in time but not space. The resulting catalog demonstrates the strong correlation of bursts of tremor activity and aseismic slip over multiple slow slip cycles. The M ~ 7 long‐term SSEs in the states of Guerrero and Oaxaca are associated with the longest sequences of tremor bursts. Each of these tremor bursts are made up of a series of smaller bursts. In between the large M7 SSEs, there are shorter‐duration, isolated tremor bursts. In Guerrero, these shorter bursts were found to accompany M ~ 6 short‐term SSEs. The occurrence of these short‐duration tremor bursts in Oaxaca demonstrates that small short‐term SSEs occur in both major slow slip regions in Mexico. The discrete range of tremor burst sizes and rates suggests that slow slip events in the Mexican subduction zone are organized into characteristic moment and moment rates. The catalog also reveals other aseismic transients, such as postseismic slip in Oaxaca after the 16 February 2018 M_w 7.2 Pinotepa Nacional earthquake. We highlight that such long‐term catalogs are a useful tool together with geodetic observations to monitor slow slip activity that potentially plays a role in the subduction megathrust cycle.

Item Type:Article
Related URLs:
URLURL TypeDescription ItemData
Husker, Allen0000-0003-1139-0502
Frank, William B.0000-0001-7892-3081
Kostoglodov, Vladimir0000-0001-7169-3121
Kazachkina, Ekaterina0000-0003-0400-0350
Additional Information:© 2018 American Geophysical Union. Issue Online: 26 February 2019; Version of Record online: 12 January 2019; Accepted manuscript online: 21 December 2018; Manuscript accepted: 19 December 2018; Manuscript revised: 16 November 2018; Manuscript received: 06 August 2018. SSN data were obtained from the Servicio Sismológico Nacional (México). We thank its personnel for station maintenance, data acquisition, and distribution. Data can be accessed at This work was funded by a grant from UNAM, PAPIIT IN107116.
Funding AgencyGrant Number
Universidad Nacional Autónoma de México (UNAM)IN107116
Subject Keywords:tectonic tremor; slow slip; Mexico
Issue or Number:1
Record Number:CaltechAUTHORS:20210507-101902244
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Official Citation:Husker, A., Frank, W. B., Gonzalez, G., Avila, L., Kostoglodov, V., & Kazachkina, E. (2019). Characteristic tectonic tremor activity observed over multiple slow slip cycles in the Mexican subduction zone. Journal of Geophysical Research: Solid Earth, 124, 599–608.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109006
Deposited By: Tony Diaz
Deposited On:07 May 2021 17:27
Last Modified:07 May 2021 17:27

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