InSAR-Based Mapping to Support Decision-Making after an Earthquake

Béjar‐Pizarro, Marta; Álvarez‐Gómez, José A.; Staller, Alejandra; Luna, Marco P.; Pérez‐López, Raúl; Monserrat, Oriol; Chunga, Kervin; Lima, Annamaria; Arnedo, Jorge Pedro Galve; Díaz, José J. Martínez; Mateos, Rosa María; Herrera, Gerardo

doi:10.3390/rs10060899

Cited by 19 publications

(8 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many recent studies have focused to the usage of SAR technology in the estimation of ground deformation after large earthquakes: Reference [14] estimated the land displacement but without detecting the active major faults; Reference [15] highlighted the need to consider the coherence change analysis and identify the limitations of the SAR applications; others ( [16][17][18][19][20]) estimated earthquake's impact assessment based on the data derived from SAR. Furthermore, the SAR technique is now used for the study of earthquakes and has been applied around the World ( [21][22][23][24][25]) and in Europe ( [26][27][28]).…”

Section: Introductionmentioning

confidence: 99%

Coseismic Ground Displacement after the Mw6.2 Earthquake in NW Croatia Determined from Sentinel-1 and GNSS CORS Data

et al. 2021

View full text Add to dashboard Cite

At the very end of the year 2020, on 29 December, a hazardous earthquake of Mw = 6.2 hit the area of Petrinja and its surroundings, in the NW of Croatia. The earthquake was felt across the area of 400 km, leaving an inconceivable damage in the vicinity of the epicenter, devastated towns and ruined lives. In order to map the spreading of earthquake waves and to determine the coseismic ground displacement after the mainshock, we have analyzed open satellite radar images of Sentinel-1 and the GNSS data from the nearest CORS station related to the epicenter, along with the seismic faults. In this paper, we addressed and mapped the displacement linear surface ruptures detected by the SAR interferometry. The results show the vertical ground displacement to the extent of −12 cm in the southern area and up to 22 cm in the north-western part of a wide area struck by the earthquake impact, related to the epicenter. Subsidence and uplift in a range of ±5 cm over a wider affected area indicate a spatial extent and hazardous impact made by the earthquake. The ground displacement of 30 cm to the West and 40 cm to the East has been identified considering the intersection of Pokupsko and Petrinja strike-slip fault system in the seismic zone of Pannonian basin. Accordingly, we obtained matching results of 5 cm south-easting shift and −3 cm subsidence on Sisak GNSS CROPOS station, addressing the tectonic blocks movement along the activated complex fault system. The results compared with the geology data confirm the existence of two main faults; the Pokupsko and the Petrinja strike-slip faults and interpret the occurrence of secondary post-seismic events over the observed area.

show abstract

Section: Introductionmentioning

confidence: 99%

Coseismic Ground Displacement after the Mw6.2 Earthquake in NW Croatia Determined from Sentinel-1 and GNSS CORS Data

et al. 2021

View full text Add to dashboard Cite

show abstract

“…InSAR has been widely used by researchers in different fields of research over the past decade. InSAR shows significant advantages in various fields of geoscience, including seismicity research [8,9,10,11], volcanic research [12], artificial building deformation monitoring [13], and surface deformation caused by underground resource exploitation [14,15]. In the case of urban areas research, Yang Zhang et al used RADARSAT-2 satellite data to monitor the land subsidence of Wuhan, China, with Small BAseline Subset (SBAS) [16].…”

Section: Introductionmentioning

confidence: 99%

Monitoring the Land Subsidence Area in a Coastal Urban Area with InSAR and GNSS

Chen

Zhang

2019

Sensors

View full text Add to dashboard Cite

In recent years, the enormous losses caused by urban surface deformation have received more and more attention. Traditional geodetic techniques are point-based measurements, which have limitations in using traditional geodetic techniques to detect and monitor in areas where geological disasters occur. Therefore, we chose Interferometric Synthetic Aperture Radar (InSAR) technology to study the surface deformation in urban areas. In this research, we discovered the land subsidence phenomenon using InSAR and Global Navigation Satellite System (GNSS) technology. Two different kinds of time-series InSAR (TS-InSAR) methods: Small BAseline Subset (SBAS) and the Permanent Scatterer InSAR (PSI) process were executed on a dataset with 31 Sentinel-1A Synthetic Aperture Radar (SAR) images. We generated the surface deformation field of Shenzhen, China and Hong Kong Special Administrative Region (HKSAR). The time series of the 3d variation of the reference station network located in the HKSAR was generated at the same time. We compare the characteristics and advantages of PSI, SBAS, and GNSS in the study area. We mainly focus on the variety along the coastline area. From the results generated by SBAS and PSI techniques, we discovered the occurrence of significant subsidence phenomenon in the land reclamation area, especially in the metro construction area and the buildings with a shallow foundation located in the land reclamation area.

show abstract

“…We believe the geometry of this model is paralleled at Pedernales and Cayambe. Further to this Béjar-Pizarro et al (2018) model the stress change from the CMT focal mechanism of the Pedernales mainshock, and suggest that Cayambe lies in a region of "high level potential activation" where induced normal stress (Δσ) <0.1 bar.…”

Section: Dynamic and Static Triggeringmentioning

confidence: 62%

Evolution of Seismicity During a Stalled Episode of Reawakening at Cayambe Volcano, Ecuador

et al. 2021

View full text Add to dashboard Cite

Cayambe Volcano is an ice-capped, 5,790 m high, andesitic-dacitic volcanic complex, located on the equator in the Eastern Cordillera of the Ecuadorian Andes. An eruption at Cayambe would pose considerable hazards to surrounding communities and a nationally significant agricultural industry. Although the only historically documented eruption was in 1785, it remains persistently restless and long-period (LP) seismicity has been consistently observed at the volcano for over 10 years. However, the sparse monitoring network, and complex interactions between the magmatic, hydrothermal, glacial, and tectonic systems, make unrest at Cayambe challenging to interpret. In June 2016 a seismic “crisis” began at Cayambe, as rates of high frequency volcano-tectonic (VT) earthquakes increased to hundreds of events per day, leading to speculation about the possibility of a forthcoming eruption. The crisis began 2 months after the Mw7.8 Pedernales earthquake, which occurred on the coast, 200 km from Cayambe. Here we show that the 2016 seismicity at Cayambe resulted from four distinct source processes. Cross correlation, template matching, and spectral analysis isolate two source regions for VT earthquakes–tectonic events from a regional fault system and more varied VTs from beneath the volcanic cone. The temporal evolution of the LP seismicity, and mean Q value of 9.9, indicate that these events are most likely generated by flow of hydrothermal fluids. These observations are consistent with a model where a new pulse of magma ascent initially stresses regional tectonic faults, and subsequently drives elevated VT seismicity in the edifice. We draw comparisons from models of volcano-tectonic interactions, and speculate that static stress changes from the Pedernales earthquake put Cayambe volcano in an area of dilation, providing a mechanism for magma ascent. Our findings provide a better understanding of “background” seismicity at Cayambe allowing faster characterization of future crises, and a benchmark to measure changes driven by rapid glacial retreat.

show abstract

InSAR-Based Mapping to Support Decision-Making after an Earthquake

Cited by 19 publications

References 62 publications

Coseismic Ground Displacement after the Mw6.2 Earthquake in NW Croatia Determined from Sentinel-1 and GNSS CORS Data

Coseismic Ground Displacement after the Mw6.2 Earthquake in NW Croatia Determined from Sentinel-1 and GNSS CORS Data

Monitoring the Land Subsidence Area in a Coastal Urban Area with InSAR and GNSS

Evolution of Seismicity During a Stalled Episode of Reawakening at Cayambe Volcano, Ecuador

Contact Info

Product

Resources

About