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A closely-spaced magnetotelluric study of the Ahuachapán-Chipilapa geothermal field, El Salvador by JoséManuel Romo; Carlos Flores; Raymundo Vega; Rogelio Vazquez; Marco A. Pérez Flores; Enrique Gómez Treviño; Francisco J. Esparza; Julio E. Quijano; Victor H. García is a Engineering article available to read on EtoBox.

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The distribution of electrical conductivity beneath the AhuachapPn-Chipilapa geothermal area was simulated using 2-D models based on 126 closely-spaced magnetotelluric (MT) measurements. The observed MT response was interpreted as being produced by the superposition of two orthogonal geological structural systems: an approximately E-W regional trend associated with the Central Graben structure, which affects the longer period response, and a local and younger N-S fault system that is responsible for the short-tointermediate period data. The MT response in the 0.02-10 s range period was used to simulate the conductivity structure within the first 2 km depth. By correlating the low-resistivity zones between twelve 2-D models, maps of the spatial distribution of conductors at three different depth levels were constructed. Three deep conductors were identified, one of them associated with the Ahuachapin reservoir, another apparently related to the Laguna Verde volcano, and a third one controlled by El Tortuguero Graben. The subsurface geometry of these conductivity anomalies suggests that the Chipilapa and La Labor hot springs are supplied by two separate sources of hot fluids, one com

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Author

JoséManuel Romo; Carlos Flores; Raymundo Vega; Rogelio Vazquez; Marco A. Pérez Flores; Enrique Gómez Treviño; Francisco J. Esparza; Julio E. Quijano; Victor H. García

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0375-6505)

Published

1997

Language

EN

Field

Engineering (Physical Sciences)