scholarly journals Optimally Oriented Remote Triggering in the Coso Geothermal Region

2020 ◽  
Vol 125 (8) ◽  
Author(s):  
Richard Alfaro‐Diaz ◽  
Aaron A. Velasco ◽  
Kristine L. Pankow ◽  
Debi Kilb
Keyword(s):  
Remote Triggering ◽  
Geothermal Region

scholarly journals Induced and endogenous acoustic oscillations in granular faults

2018 ◽  
Vol 377 (2136) ◽  
pp. 20170389 ◽  
Author(s):  
L. de Arcangelis ◽  
E. Lippiello ◽  
M. Pica Ciamarra ◽  
A. Sarracino
Keyword(s):  
Disordered Systems ◽  
Statistical Physics ◽  
Friction Reduction ◽  
Granular Systems ◽  
Acoustic Oscillations ◽  
Frictional Properties ◽  
External Perturbations ◽  
Seismic Fault ◽  
Perturbation Frequency ◽  
Remote Triggering

The frictional properties of disordered systems are affected by external perturbations. These perturbations usually weaken the system by reducing the macroscopic friction coefficient. This friction reduction is of particular interest in the case of disordered systems composed of granular particles confined between two plates, as this is a simple model of seismic fault. Indeed, in the geophysical context frictional weakening could explain the unexpected weakness of some faults, as well as earthquake remote triggering. In this manuscript, we review recent results concerning the response of confined granular systems to external perturbations, considering the different mechanisms by which the perturbation could weaken a system, the relevance of the frictional reduction to earthquakes, as well as discussing the intriguing scenario whereby the weakening is not monotonic in the perturbation frequency, so that a re-entrant transition is observed, as the system first enters a fluidized state and then returns to a frictional state. This article is part of the theme issue ‘Statistical physics of fracture and earthquakes’.

scholarly journals Remote triggering of fault-strength changes on the San Andreas fault at Parkfield

Nature ◽  
2009 ◽  
Vol 461 (7264) ◽  
pp. 636-639 ◽  
Author(s):  
Taka’aki Taira ◽  
Paul G. Silver ◽  
Fenglin Niu ◽  
Robert M. Nadeau
Keyword(s):  
San Andreas Fault ◽  
San Andreas ◽  
Fault Strength ◽  
Remote Triggering

Development of a Real–Time Embedded Remote Triggering and Monitoring System with SC12

2012 ◽  
Author(s):  
Yew Leong Chui ◽  
Abdul Rahman Ramli
Keyword(s):  
Embedded System ◽  
Key Words ◽  
Real Time ◽  
Monitoring System ◽  
Error Detection ◽  
Data Interpretation ◽  
Time Error ◽  
Simultaneous Operation ◽  
Diagnostic Features ◽  
Remote Triggering

Kertas kerja ini membentangkan sistem kawalan dan pemantauan jarak jauh dengan menggunakan SC12. Satu penukar protokol dengan unit interpretasi data telah direka bentuk dan dilaksana. Untuk menambahkan saluran operasi unit interpretasi data, satu ciri auto–diagnostik pintar telah dilaksana untuk mengesan ralat. Kata kunci: Sistem terbenam, sistem pemicuan dan pemantauan, auto-diagnostik This paper presents a real–time embedded remote triggering and monitoring system using SC12. A protocol converter associated with data interpretation unit has been developed and implemented. In order to expand simultaneous operation channel with data interpretation unit, intelligent auto–diagnostic features has been implemented for run–time error detection purposes. Key words: Embedded system, triggering and monitoring system, auto-diagnostic

scholarly journals Determination of Hydrothermal Prospects in Paipa Geothermal Region (Boyacá, Colombia) Using Remote Sensing and Field Data

2019 ◽  
Vol 23 (4) ◽  
pp. 265-282
Author(s):  
Rafael Andrés Calderón-Chaparro ◽  
German Vargas-Cuervo
Keyword(s):  
Remote Sensing ◽  
Soil Temperature ◽  
Field Data ◽  
Hot Springs ◽  
Landsat 8 ◽  
Geothermal Resources ◽  
Temperature Index ◽  
Landsat 7 ◽  
Geothermal Region

Geothermal resources (e.g. hot springs) are found with the help of field techniques, such as geological, geochemistry and geophysical. These techniques in some occasions are difficult to apply because of the limit access to the research area, rising operational costs and constrained spatially the exploration areas. The thermal infrared (TIR) remote sensing is an important tool for the exploration of geothermal resources, due to the low cost and high efficiency in the study of large geographic areas. The aim of this study is to use thermal imagery of satellite remote sensing and combined with geological-geophysical data, for spatial determination of exploratory prospects of hot springs in the geothermal region of Paipa, Boyacá. The images used in this study are from satellites Landsat-7 ETM+, Landsat-8 OLI/TIRS, MODIS, ALOS-PALSAR and Pléiades. Also, field data is used, such as soil temperature, surface temperature, air temperature, relative humidity, atmospheric pressure and thermal imagery of surface geothermal manifestations. The Landsat thermal bands were radiometrically calibrated, then atmospherically and surface emissivity corrected, applying single channel and split window algorithms, for Landsat-7 ETM+ and Landsat-8 TIRS, respectively. The field data helped to correct the thermal bands. And the soil temperature data are used to create a subsurface temperature map at 1-meter depth. Once primary and secondary data is had, in a geographic information system (GIS) is implemented an unweighted spatial model, which use four input indicators (satellite temperature index, soil temperature index, structural lineaments index and iso-resistivity index) to determine the areas with higher probability to find geothermal fluids. Six prospects are highlighted for hydrothermal fluid extraction, in which two of them are already known. Results allow to concluded that thermal remote sensing are useful to map geothermal anomalies in the Paipa region, and by using these anomalies plus geological-geophysical information is possible to determine exact exploration areas.

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