Wyniki wyszukiwania - BazTech

1

Soil gas survey in and around Shanchiao fault of northern Taiwan for establishing continuous monitoring station

Kumar A., Walia V., Sung Y.-S., Lin S.-J., Fu C.-C., Wen K.-L.

Acta Geophysica

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2018

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Vol. 66, no. 5

1213--1221

EN

The present study deals with the soil gas geochemical surveys in and around Shanchiao fault to pick the sites for integrated radon monitoring using SSNTDs to better understand the response of tectonic activity of the fault systems. Throughout these surveys, gathered samples of soil gas has been analysed for radon and carrier gases namely CO2, He, N2, O2, CH4 and Ar. The RAD 7 instrument has been utilized for radon analysis and gas chromatograph instrument for analysing the carrier gases. The predominance of gas spread has been explored based on the results of these surveys and three sites have been chosen for integrated observation with regard to seismotectonic activity to examine the affectability of the sites utilizing SSNTDs. From these sites, a site will be chosen for future long duration continuous observance on the premise of its affectability towards the seismotectonic activity inside the territory.

2

Characterization of some selected mud volcanoes of southern Taiwan

Kumar A., Yang T.-H., Walia V., Sung Y.-C., Lee H.-F., Lin S.-J., Wen K.-L.

Acta Geophysica

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2018

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Vol. 66, no. 5

1257--1265

EN

In the present study, some mud volcanoes in Pingtung and Kaohsiung areas were selected. The selected mud volcanoes are located above the mud diaper system in southern Taiwan. Three different sampling techniques were used to collect samples in and around the said mud volcanoes. The results show that river water samples from different places fall on the meteoric line. Mud samples are found to be heavier in oxygen isotope while hydrogen isotope remains the same. Soil gas samples were also collected at the depth of 1 m and dissolved gases from the mud volcanic site (or nearby) were collected for gas chromatography analyses. Soil gas samples and dissolved gas from mud pool and groundwater were analyzed for radon concentration using RAD7 (solid-state nuclear track detector) bi-weekly. Long-term investigation will be needed to understand the relationship of mud volcanoes the eruption cycle with gas composition variations. It will also help to understand their relationship with tectonic activities in the region.

3

Radon-thoron monitoring in tatun volcanic areas of northern Taiwan using LR-115 Alpha track detector technique: Pre-calibration and installation

Kumar A., Walia V., Yang T., Chang H., Lin S., Eappen K., Arora B

Acta Geophysica

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2013

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Vol. 61, no. 4

958-976

EN

In the present study, experiments have been carried out to calibrate LR-115 alpha detector films in bare and cup-mode exposure for the measurement of radon and thoron concentrations in soil gas. Results showed non-uniformity in track formation on the films in bare-mode exposure. However, in cup-mode exposure the non-uniformity was reduced to a greater extent. The calibration factors obtained for radon in bare- and cup-mode exposures are 0.049 and 0.034 tr. cm−2 per Bq m−3 d, respectively. An attempt has been made to calibrate the radon-thoron discriminative cup with LR-115 films for simultaneous measurements of radon and thoron. This paper also presents the preliminary results of radonthoron monitoring in Tatun volcanic areas of northern Taiwan for the first time using radon-thoron discriminators with LR-115 films. The results show that the safe temperature to install the LR-115 films in volcanic areas is ≤ 65°C and thoron concentration in the study area is low.