scholarly journals Mechanical responses and earthquake activities on tectonic setting of Banda block (case study: Ambon earthquake occurred on September 26, 2019)

2021 ◽  
Author(s):  
Jaya Murjaya ◽  
Dwikorita Karnawati ◽  
Supriyanto ◽  
Rahmat S. Yuliatmoko ◽  
Thomas Hardy ◽  
...  
Keyword(s):  
Tectonic Setting ◽  
Mechanical Responses

scholarly journals Varying Contents of Sources Affect Tectonic-Setting Discrimination of Sediments: A Case Study from Permian Sandstones in the Eastern Tianshan, Northwestern China

2017 ◽  
Vol 125 (3) ◽  
pp. 299-316 ◽  
Author(s):  
Xiaoran Zhang ◽  
Guochun Zhao ◽  
Paul R. Eizenhöfer ◽  
Min Sun ◽  
Yigui Han ◽  
...  
Keyword(s):  
Tectonic Setting ◽  
Northwestern China ◽  
Eastern Tianshan

scholarly journals Influencing Factors on Petrography Interpretations in Provenance Research—A Case-Study Review

Geosciences ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 205
Author(s):  
Carita Augustsson
Keyword(s):  
Influencing Factors ◽  
Tectonic Setting ◽  
Initial Step ◽  
Petrographic Composition ◽  
Rock Fragments ◽  
Data Points ◽  
Provenance Research ◽  
Main Components ◽  
End Members

The use of framework petrography is a common initial step in provenance research of sand and sandstone. The data tend to be interpreted based on the three main components quartz, feldspar, and lithic fragments. Surprisingly often, this is done without taking other influencing factors than the tectonic setting of the catchment and/or the surroundings of the depositional basin into account. Based on a database of 14 studies with approximately 900 petrographic data points from sand and sandstone, this study demonstrates quantitative effects on the apparent composition resulting from both geological and non-geological biases. The study illustrates sandstone-classification differences based on different specifications of the three end-members quartz, feldspar, and lithic or rock fragments, how the point-counting method can affect the apparent petrographic composition of sandstone, how sorting and facies bias may be differentiated from a climate or provenance signal, and how bias due to diagenetic effects can be minimised. In conclusion, both geological and non-geological biases should be considered for provenance studies that include petrographic data.

scholarly journals Geochemical Markers as a Tool for the Characterization of a Multi-Layer Urban Aquifer: The Case Study of Como (Northern Italy)

Water ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 124
Author(s):  
Gilberto Binda ◽  
Francesca Frascoli ◽  
Davide Spanu ◽  
Maria F. Ferrario ◽  
Silvia Terrana ◽  
...  
Keyword(s):  
Water Quality ◽  
Natural Water ◽  
Tectonic Setting ◽  
Northern Italy ◽  
Sediment Geochemistry ◽  
Factors Affecting ◽  
Deep Aquifers ◽  
Geochemical Markers ◽  
Main Factors

The analysis of geochemical markers is a known valid tool to explore the water sources and understand the main factors affecting natural water quality, which are known issues of interest in environmental science. This study reports the application of geochemical markers to characterize and understand the recharge areas of the multi-layer urban aquifer of Como city (northern Italy). This area presents a perfect case study to test geochemical markers: The hydrogeological setting is affected by a layered karst and fractured aquifer in bedrock, a phreatic aquifer hosted in Holocene sediments and connected with a large freshwater body (Lake Como); the aquifers recharge areas and the water geochemistry are unknown; the possible effect of the tectonic setting on water flow was overlooked. In total, 37 water samples were collected including water from two stacked aquifers and surface water to characterize hydrochemical features. Moreover, six sediment samples in the recent palustrine deposits of the Como subsurface were collected from cores and analyzed to understand the main geochemistry and mineralogy of the hosting material. The chemical analyses of water allow to observe a remarkable difference between the shallow and deep aquifers of the study area, highlighting different recharge areas, as well as a different permanence time in the aquifers. The sediment geochemistry, moreover, confirms the differences in trace elements derived from sediment-water interaction in the aquifers. Finally, an anomalous concentration of As in the Como deep aquifer was observed, suggesting the need of more detailed analyses to understand the origin of this element in water. This study confirms the potentials of geochemical markers to characterize main factors affecting natural water quality, as well as a tool for the reconstruction of recharge areas.

Fluid geochemistry versus tectonic setting: the case study of Morocco

2006 ◽  
Vol 262 (1) ◽  
pp. 131-145 ◽  
Author(s):  
F. Tassi ◽  
O. Vaselli ◽  
G. Moratti ◽  
L. Piccardi ◽  
A. Minissale ◽  
...  
Keyword(s):  
Tectonic Setting ◽  
Fluid Geochemistry

Deep geothermal-induced seismicity: controlling factors and hazard mitigation measures

2021 ◽  
Author(s):  
Francesca De Santis ◽  
Emmanuelle Klein ◽  
Alain Thoraval
Keyword(s):  
Induced Seismicity ◽  
Tectonic Setting ◽  
Direct Consequence ◽  
Mitigation Measures ◽  
Anthropogenic Factors ◽  
Seismic Events ◽  
Geothermal Systems ◽  
Operational Parameters ◽  
Spatio Temporal

<p>As many industrial activities impacting the underground, deep geothermal projects can be associated with the occurrence of induced seismic events. This seismicity is sometimes a direct consequence of stimulation operations needed to enhance the permeability of geothermal reservoirs, but, in other cases, it can also occur in different phases of geothermal projects, as during wells shut-in, after injection operations, or during the production phase, which generally implies lower flow rates and injection pressures. The intensity of this seismicity, in terms of magnitudes of seismic events, can be extremely variable, from microseismic events (M < 2), not felt at the surface, to large earthquakes (M > 5) that pose a serious risk to neighboring populations and may lead to the abandon of geothermal projects. In this context, it is of paramount importance to: i) better characterize and understand the interactions between natural and anthropogenic factors which may lead to geothermal-induced seismicity and ii) evaluate currently applied approaches to handle and minimize associated risks.</p><p>The objective of this work is to establish a state of the art about deep geothermal-induced seismicity, by describing factors that have a bearing on the generation of seismic events, as well as by discussing existing means to handle their occurrence. Based on a worldwide review of geothermal projects, we created a large database describing each selected case study in terms of geological properties and tectonic setting, operational parameters and type of geothermal systems, as well as spatio-temporal characteristics of the observed induced seismicity. Collected data are analyzed in order to better understand possible cause-effect relationships between induced seismicity and geothermal operations with the aim of identifying the most important preexisting and anthropogenic factors, as well as their interactions, which may have a key role on the occurrence of seismic activity.       </p>

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