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Imaging of Tectonic Tremor Activity Along the NW Caribbean Coast and its Implication with Subduction Processes: A Study Case with Colombia-Venezuela CARMA Seismological Network

Description: 

The discovery of low-frequency earthquakes and especially non-volcanic tremors revealed the complexity and variety of seismic sources associated with active deformations in different tectonic settings. A long-term analysis of episodic tectonic tremor occurrences was inferred from continuous data obtained from seismological broadband stations recorded by The CARibbean Merida Andes Broadband Experiment (CARMA) consisting of 65 broadband stations extending from the Caribbean sea in northern Colombia and Venezuela to the northern South America interior. Through the preliminary detection methodology from a semi-automatic tremor detection algorithm (Chao & Yu, 2018) using seismic data from 2016-2017, we could identify triggered tectonic tremor associated with several M6+ teleseismic earthquakes occurred in this period and its influence along major structural features associated with the Caribbean plate subducting beneath northern South America as well as major crustal faults such as the Bucaramanga-Santa Marta and Boconó faults. This study aims to generate a map of tremor activity locating the identified tremor events using a grid-searching technique exploiting the coherency of multi-scale, frequency-selective characteristics of the non-stationary signals recognized as tremor events in a region in which it has previously been unrecognized and together with geodetic observations can help better understand the tectonic setting in this complex region and whether or not there are slow slip processes.

Session: Active Faults in the Caribbean and Central America [Poster]

Type: Poster

Date: 4/20/2023

Presentation Time: 08:00 AM (local time)

Presenting Author: Sofia Cubillos

Student Presenter: Yes

Invited Presentation: 

Authors