InSAR-Based Mapping to Support Decision-Making after an Earthquake
Béjar Pizarro, Marta ; Álvarez Gómez, José Antonio ; Staller, Alejandra ; Luna, Marco P. ; Pérez López, Raúl ; Montserrat, Oriol ; Chunga, Kervin ; Lima Abásolo, Aracely ; Galve, Jorge Pedro ; Martínez Díaz, José Jesús ; Mateos Ruiz, Rosa María ; Herrera García, Gerardo
Citation: Remote sensing (2018), vol.10, n.899, 24 p.
Spatial Study: Ecuador
Sponsorship: Geohazards InSAR Laboratory and Modeling Group, Instituto Geológico y Minero de España, España, Departamento de Geodinámica, Estratigrafía y Paleontología, Universidad Complutense de Madrid, España, Departamento de Ingeniería Topográfica y Cartografía, Universidad Autónoma de Madrid, España, Universidad de las Fuerzas Armadas ESPE, Ecuador, Centre Tecnològic de les Telecomunicacions de Catalunya, España, Departamento de Construcciones Civiles, Universidad Técnica de Manabí, Ecuador, Facultad de Ciencias de la Ingeniería, Universidad Estatal Península de Santa Elena, Ecuador, Instituto Nacional de Investigación Geológico Minero Metalúrgico, Ecuador, Departamento de Geodinámica, Universidad de Granada, España
Relation: ECHO/SUB/2015/718679, CGL2013-47412, CGL2017-83931-C3, QUAKESTEP (1-P) + 3GEO(2-P) + GEOACTIVA (3-P)
Funder: Directorate General Humanitarian Aid and Civil Protection, Comisión Europea, Ministerio de Economía y Competitividad, España
It has long been recognized that earthquakes change the stress in the upper crust around the fault rupture and can influence the behaviour of neighbouring faults and volcanoes. Rapid estimates of these stress changes can provide the authorities managing the post-disaster situation with valuable data to identify and monitor potential threads and to update the estimates of seismic and volcanic hazard in a region. Here we propose a methodology to evaluate the potential influence of an earthquake on nearby faults and volcanoes and create easy-to-understand maps for decision-making support after large earthquakes. We apply this methodology to the Mw 7.8, 2016 Ecuador earthquake. Using Sentinel-1 Interferometric Synthetic Aperture Radar (InSAR) and continuous GPS data, we measure the coseismic ground deformation and estimate the distribution of slip over the fault rupture. We also build an alternative source model using the Global Centroid Moment Tensor (CMT) solution. Then we use these models to evaluate changes of static stress on the surrounding faults and volcanoes and produce maps of potentially activated faults and volcanoes. We found, in general, good agreement between our maps and the seismic and volcanic events that occurred after the Pedernales earthquake. We discuss the potential and limitations of the methodology.
InSAR, Sentinel-1, GPS, Ecuador earthquake, stress changes, active faults, volcanoes, decision-making
Name: insar_based_mappi ...