N. Segovia

Universidad Estatal de Milagro

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Elsa Támez

Polícia Judiciária

P. Peña

Instituto Politécnico de Lisboa

M. A. Armienta

Universidad Nacional Autónoma de México

M. I. Gaso

Instituto Nacional de Investigaciones Nucleares

M. Monnin

Université de Montpellier

J.L. Seidel

Laboratoire HydroSciences Montpellier

Manuel López Cervantes

Instituto Nacional de Investigaciones Nucleares

M. Mena

Peruvian Union University

M. Mena

Universidad de La Sabana

S. Salazar

Universidad Nacional de Colombia

Cooperative Institutions

Universidad Nacional Autónoma de México

Instituto Nacional de Investigaciones Nucleares

Centre National de la Recherche Scientifique

Instituto de Investigaciones Eléctricas

Instituto Universitario Anglo Español

Université de Montpellier

Institut National de Physique Nucléaire et de Physique des Particules

Instituto Politécnico Nacional

Universidad Autónoma Metropolitana

Laboratoire HydroSciences Montpellier

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Water chemistry and soil radon survey at the Poas volcano (Costa Rica)

Annals of Geophysics (2009)

J. Barquero E. Fernández M. Monnin J.L. Seidel N. Segovia

Radon-in-soil monitoring at the Poas volcano (Costa Rica) has been performed together with water chemistry from the hot crater lake since 1981 and 1983 respectively. The results are discussed as a function of the eruptive evolution of the volcano over a 13 years period (1981-1994). It is shown that no definitely clear precursory radon signals have been recorded. On the contrary, ionic species concentrations are likely to be considered good precursors, together with the temperature variations of the crater lake water.

Crater lake

10.4401/ag-3195

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Citations (5)

Environmental radon studies in Mexico

Environmental Geochemistry and Health (2007)

N. Segovia M. I. Gaso M. A. Armienta

Nuclear track

10.1007/s10653-006-9069-6

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Citations (33)

137Cs and 226Ra determination in soil and land snails from a radioactive waste site

The Science of The Total Environment (1995)

M. I. Gaso Manuel López Cervantes N. Segovia Francisco J. Abascal S. Salazar

Biota

Soil test

Land snail

10.1016/0048-9697(95)04763-8

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Citations (16)

Short and long term radon in soil monitoring for geophysical purposes

Radiation Measurements (1995)

N. Segovia M. Mena J.L. Seidel M. Monnin Elsa Támez

Seismic zone

10.1016/1350-4487(95)00181-d

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Citations (29)

Radon monitoring related to a subduction zone in Mexico

Nuclear Tracks and Radiation Measurements (1993)

N. Segovia M. Mena Elsa Támez

10.1016/0969-8078(93)90102-a

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Citations (6)

Soil radon time series: Surveys in seismic and volcanic areas

Radiation Measurements (1999)

N. Segovia M. Mena P. Peña Elsa Támez J.L. Seidel

Soil gas

10.1016/s1350-4487(99)00142-0

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Citations (43)

Effects of changes in reservoir thermodynamic conditions on ²²²Rn composition of discharged fluids: study for two wells at Los Azufres geothermal field (Mexico)

Geofluids (2008)

Rosa Marı́a Barragán Víctor Manuel Arellano E. Portugal N. Segovia

Abstract 222 Rn anomalies that occurred at the time of the 19 September 1985 M8.1 Michoacan, Mexico, earthquake in fluids from two wells of Los Azufres, geothermal field were studied considering (i) the changes in well‐bottom thermodynamic conditions (pressure, enthalpy and steam/water ratio) and (ii) the discharged mass flow rates. In the studied steam well the anomalously high 222 Rn concentration (as compared with background data) was observed on 11 September and was due to an important compressive process, which formed two‐phase fluids at reservoir, where usually single steam occurred. This caused the increase in 222 Rn, as it remained in the steam. The compressive process was partially induced by changes in the production conditions at wellhead (because a well test was being developed) when sampling, but it was also seismic‐induced, as similar 222 Rn anomalies were observed in other steam wells for which stable conditions at sampling were maintained. Another case is given for a two‐phase well where anomalously low 222 Rn values (compared to background data) were recorded in September–October 1985. As stable conditions were maintained during sampling (1983–1986), 222 Rn data were correlated to ?twb> the total mass flow rates produced by the well. Results suggested that the well produced two types of liquid–steam mixtures with a common end‐member regarding the liquid, but implying two ‘end‐member’ fluids with different 222 Rn contents. The most 222 Rn enriched end‐member was regarded as the original reservoir steam while that with relatively lower 222 Rn concentration was stated as likely constituted by a mixture of reservoir and reinjection fluids. From the linear correlations, 222 Rn contents for both end‐members were estimated while the 222 Rn composition of the reservoir liquid feeding the studied well was estimated to be negligible compared to steam from the intersection of both curves. As one anomalously low 222 Rn value was measured for a sample collected on the 12 September 1985, it seemed that a seismic‐induced process increased the reservoir permeability just before the earthquake allowing the liquid to reach the production zones of some two‐phase wells. This interpretation was supported by the behaviour of gas species (CO 2 and N 2 ) and δD in the two‐phase well studied and injection mass flow rates in one probably‐related reinjection well.

Wellhead

Mass flow

10.1111/j.1468-8123.2008.00229.x

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Citations (5)

Indoor radon exposure and excess of lung cancer mortality: the case of Mexico—an ecological study

Environmental Geochemistry and Health (2020)

Guadalupe Ponciano‐Rodríguez M. I. Gaso M. A. Armienta Citlali Trueta José Iván Morales-Arredondo

Radon exposure

Ecological study

10.1007/s10653-020-00662-8

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