Saline Intrusion in Guaymas Valley, México from Time-Domain Electromagnetic Soundings

Silvia Martinez Retama, Carlos Francisco Flores Luna, José Castillo Gurrola

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A severe salt water intrusion in Guaymas Valley, Sonora is mapped by means of 44 time-domain electromagnetic soundings. In the southern part of the valley the resistivity distribution is simple. A conducting layer associated with the saline intrusion in the upper aquifer shows a systematic increase of resistivity inland. Three soundings feature a low- resistivity layer within this conductor, suggesting higher salinity at the bottom. The northern zone has a complex electrical structure, but a conductor with increasing resistivity can be recognized. The results suggest that the lower aquifer is not affected by the intrusion. When plotted against salinity the conductivity is biased with respect to the predictions of Archie's Law. Clay lenses in the unsaturated sediments may account for the bias and dispersion of conductivities.
Translated title of the contributionIntrusión salina en el valle de Guaymas, México a partir de sondeos electromagnéticos en el dominio del tiempo
Original languageEnglish
Article number1
Pages (from-to)175
Number of pages198
JournalGeofísica Internacional
Issue number3
StatePublished - 19 Jun 2007

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