CrossTremor: An Automatic Detection Code of Tremors with Tectonic Earthqukes as Green’s Functions

CrossTremor a cross correlation code for detecting seismic tremors is presented. The code uses tectonic earthquakes as Green’s functions to identify non volcanic seismic tremors. A six steps methodology is proposed: Downloading the continuous recording by day, obtaining the response files and removing the instrument response of the data, identification of candidate tremors, extraction of candidate tremors, moment magnitude computation, and seismic site effects estimation. As a case of study, CrossTremor is applied to one year data (2006) of CODEX and MARS temporal seismic arrays in western Mexico. The code identified 530 non vocanic tremors in this region with moment magnitudes ranged from 3.3 to 5.0 with respective corner frequencies from 1.1 to 7.3 Hz. Estimated fundamental periods were computed in a range of 1.0 to 10.3 Hz. CrossTremor is an open software available in the GitLab repository https://gitlab.com/cramirezp/crosstremors.git.