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Local Earthquake Tomography at Los Humeros Geothermal Field (Mexico)

Toledo, T.; Gaucher, E.; Jousset, P.; Jentsch, A.; Haberland, C.; Maurer, H.; Krawczyk, C.; Calò, M.; Figueroa, A.

Abstract:
A passive seismic experiment using 25 broadband and 20 short‐period stations was conducted between September 2017 and September 2018 at Los Humeros geothermal field, an important natural laboratory for superhot geothermal systems in Mexico. From the recorded local seismicity, we derive a minimum 1‐D velocity model and obtain 3‐D Vp and Vp/Vs structures of Los Humeros. We improved the classical local earthquake tomography by using a postprocessing statistical approach. Several inversions were computed and averaged to reduce artifacts introduced by the model parametrization and to increase the resolution of the investigated region. Finally, the resulting Vp and Vp/Vs structures and associated seismicity were integrated with newly acquired geophysical and petrophysical data for comprehensive interpretation. The recorded seismicity is mainly grouped in three clusters, two of which seem directly related to exploitation activities. By combining new laboratory measurements and existing well data with our Vp model, we estimate possible geological unit boundaries. One large intrusion‐like body in the Vp model, together with neighboring high Vp/Vs anomalies, hints at a region of active resurgence or uplift due to the intrusion of new magma at the northern portion of the geothermal field. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000129653
Frei zugänglich ab 08.06.2021
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2020
Sprache Englisch
Identifikator ISSN: 2169-9313, 2169-9356
KITopen-ID: 1000129653
Erschienen in Journal of geophysical research / Solid earth
Verlag Wiley
Band 125
Heft 12
Vorab online veröffentlicht am 07.12.2020
Schlagwörter Los Humeros; geothermal exploration; induced and local seismicity; P and S velocity structure
Nachgewiesen in Scopus
Web of Science
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