Relation between structure and low-temperature geothermal systems in Fukuoka city, southwestern Japan

Saibi, Hakim; Nishijima, Jun; Hirano, T; Fujimitsu, Yasuhiro; Ehara, Sachio

doi:10.1186/bf03352833

Cited by 16 publications

(8 citation statements)

References 14 publications

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“…Previous studies have been conducted on the geological and geophysical explorations for geothermal investigations (Demirel et al, 2004;Heise et al, 2007;Mogi and Nakama, 1993;Saibi et al, 2006Saibi et al, , 2008. MT surveys were carried out on the southern margin of the Mount Amiata geothermal region (Tuscany, Italy) by Volpi et al (2003), with the aim of defining the shallow and deep electric structures related to the local geothermal reservoirs and system heat recharge.…”

Section: Introductionmentioning

confidence: 99%

Exploration and assessment of the geothermal resources in the Hammam Faraun hot spring, Sinai Peninsula, Egypt

Zaher

Saibi

Nishijima

et al. 2012

Journal of Asian Earth Sciences

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Section: Introductionmentioning

confidence: 99%

Exploration and assessment of the geothermal resources in the Hammam Faraun hot spring, Sinai Peninsula, Egypt

Zaher

Saibi

Nishijima

et al. 2012

Journal of Asian Earth Sciences

Self Cite

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“…Contacts between rocks that have different physical properties usually occur along weak boundaries (lineaments) which may consist of faults fractures, etc. Such lineaments which could show major subsurface structures are extracted using image filtering algorithms applied on gravity anomaly data (Aydogan, 2011;Saibi et al, 2008). Topographic lineaments (Kassou et al, 2012;Abdullah et al, 2010;Jordan et al, 2005;Wladis, 1999) are traced from DEM data using the same filtering techniques used in the analysis of gravity data.…”

Section: Methodsmentioning

confidence: 99%

Mapping Geologic Structures from Gravity and Digital Elevation Model in the Ziway-Shala Lakes Basin; central Main Ethiopian Rift

Kebede¹,

Alemu²,

Nedaw³

2020

Preprint

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This study attempts to delineate subsurface lineaments for the tectonically and volcanically active region of the Ziway-Shala Lakes basin, central Main Ethiopian rift. Most of the previously mapped subsurface structures in the region under consideration focus on delineating crustal structures thicknesses and Moho depths undulations. Moreover, near-surface structures in the same region were mapped using analysis of Digital Elevation Model image data. On the other hand, there are few studies that have targeted in mapping geologic structures lying at intermediate depth levels between the shallower and deeper Earth. The objective of this research is thus to map the subsurface geologic structures/lineaments to an average depth of 3 km (crystalline basement layer depth) from surface using gravity data. These investigation results are validated by Digital Elevation Model extracted lineaments. Filtering techniques including derivative filters, upward-continuation and line module algorithm of PCI Geomatica are used to extract the gravity and topographic lineaments of the region. Orientation analyses of these subsurface and surface lineaments are made using line direction histogram of the QGIS software. Accordingly, the gravity subsurface lineaments mapped in this study are found to be dominantly oriented in the NNW-SSE to NW-SE and E-W direction on average. These results appear to be contrary to the NNE-SSW to NE-SW trending surface geologic structure mapped on the bases of actual field observation carried out by previous researchers and automatically extracted lineaments based on Digital Elevation Models data considered in this research. The subsurface lineaments mapped using gravity data coincide with the orientation of pre-existing subsurface structures crossing the rift orthogonally. These structural lineaments which are considered to be masked in the subsurface coincide with the orientation of the Mesozoic Ogaden rift as compared to the overlying surface structures which appear to coincide with the orientation of the Cenozoic Main Ethiopian rift.

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“…Based on two-dimensional groundwater flow theory, the heat conduction model of Leibnitzer geothermal field was established by using FEFLOW software [9]. The heat sources of the Obama geothermal water system in Japan were studied by three-dimensional numerical model [10].…”

Section: Introductionmentioning

confidence: 99%

Hydrogeochemical Characteristics and Genesis Model of Jinjiang and Julong Hot Springs in Changbai Mountain, Northeast China

2018

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Changbai Mountain in China has been explored as a potential area for its rich hot springs including the Jinjiang and Julong hot spring groups. The hydrogeochemical characteristics and conceptual genesis models of the Jinjiang and Julong hot springs were evaluated by hydrogeochemical analysis, isotope analysis, rock sample analysis, hydrogeochemistry simulation, and geophysical exploration method. The results showed that HCO3− and Na+ were the most abundant anion and cation in the hot springs, and the hydrochemical type was Na-HCO3. And the hot springs are enriched with trace components such as H2SiO3 and Sr. The major gas composition of the Jinjiang hot springs and Julong hot springs were CO2, N2, and CH4, which were derived from the mantle. The chemical compositions were produced by feldspar and pyroxene mineral hydrolysis. The recharge source of the hot springs was atmospheric precipitation and was also influenced by evaporation, and the genetic models for the Jinjiang hot springs and Julong hot springs were as follows: the heat source of both was a magma body and heat was mainly migrated in the form of thermal conduction. The cap rocks were both composed of trachyte of Baitoushan formation, basalt of Junjianshan formation, and rhyolitic pyroclastic rocks of Changbai formation. The geothermal reservoir of both hot springs was a fracture zone with the lithology of volcanic breccia, sand, and gravel and volcanic breccia and marble, respectively.

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Relation between structure and low-temperature geothermal systems in Fukuoka city, southwestern Japan

Cited by 16 publications

References 14 publications

Exploration and assessment of the geothermal resources in the Hammam Faraun hot spring, Sinai Peninsula, Egypt

Exploration and assessment of the geothermal resources in the Hammam Faraun hot spring, Sinai Peninsula, Egypt

Mapping Geologic Structures from Gravity and Digital Elevation Model in the Ziway-Shala Lakes Basin; central Main Ethiopian Rift

Hydrogeochemical Characteristics and Genesis Model of Jinjiang and Julong Hot Springs in Changbai Mountain, Northeast China

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