1. Relation between surface dynamics and remote sensor InSAR results over the Metropolitan Area of San Salvador
- Author
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Jose Alexander Chavez Hernandez, Milan Lazecký, Jiři Šebesta, and Matúš Bakoň
- Subjects
021110 strategic, defence & security studies ,Atmospheric Science ,geography ,geography.geographical_feature_category ,010504 meteorology & atmospheric sciences ,0211 other engineering and technologies ,Subsidence ,02 engineering and technology ,Mass wasting ,Structural basin ,01 natural sciences ,Tectonics ,Volcano ,Natural hazard ,Interferometric synthetic aperture radar ,Earth and Planetary Sciences (miscellaneous) ,Caldera ,Geology ,Seismology ,0105 earth and related environmental sciences ,Water Science and Technology - Abstract
InSAR information to record dynamic changes on the surface using remote sensor has been obtained for the Metropolitan Area of San Salvador and compared with surface dynamic situation and fixed GPS surface movement information. The city is located in an active tectonic depression between the tectonic remains of ancient volcanoes and active volcanic centers. This area has been historically affected by earthquakes, volcanic activity, erosion, mass movements, and flooding. The morphology of the area has been changed by human activities, most of the time without any respect to natural processes thus increasing the problems. There are sectors that show subsidence close to Ilopango Caldera that could be connected to diastrophic block tectonic movements connected to post-seismic episodes after 2012 earthquake, and aquifer level changes due effects of climate change and overexploitation of aquifers. These movements may increase the huge problems of erosion and mass wasting through las Canas basin. In addition, after 2017 seismic swarm a horizontal movement was recorded with the satellite radar interferometry (InSAR) in two areas, which reflects the possible movement of faults that crosses the area of study. This type of information provides important data for the decision-making of land, protection and mitigation zones, monitoring of governmental institutions, and for regional planning.
- Published
- 2020
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