[논문]Surface Deformation Measurement of the 2020 Mw 6.4 Petrinja, Croatia Earthquake Using Sentinel-1 SAR Data

Achmad, Arief Rizqiyanto; Lee, Chang-Wook

doi:10.7780/kjrs.2021.37.1.11

Surface Deformation Measurement of the 2020 Mw 6.4 Petrinja, Croatia Earthquake Using Sentinel-1 SAR Data 원문보기

대한원격탐사학회지 = Korean journal of remote sensing, v.37 no.1, 2021년, pp.139 - 151

Achmad, Arief Rizqiyanto (Department of Smart Regional Innovation, Kangwon National University) , Lee, Chang-Wook (Department of Science Education, Kangwon National University)

Abstract ▼ AI-Helper

By the end of December 2020, an earthquake with Mw about 6.4 hit Sisak-Moslavina County, Croatia. The town of Petrinja was the most affected region with major power outage and many buildings collapsed. The damage also affected neighbor countries such as Bosnia and Herzegovina and Slovenia. As a light of this devastating event, a deformation map due to this earthquake could be generated by using remote sensing imagery from Sentinel-1 SAR data. InSAR could be used as deformation map but still affected with noise factor that could problematize the exact deformation value for further research. Thus in this study, 17 SAR data from Sentinel-1 satellite is used in order to generate the multi-temporal interferometry utilize Stanford Method for Persistent Scatterers (StaMPS). Mean deformation map that has been compensated from error factors such as atmospheric, topographic, temporal, and baseline errors are generated. Okada model then applied to the mean deformation result to generate the modeled earthquake, resulting the deformation is mostly dominated by strike-slip with 3 meter deformation as right lateral strike-slip. The Okada sources are having 11.63 km in length, 2.45 km in width, and 5.46 km in depth with the dip angle are about 84.47° and strike angle are about 142.88° from the north direction. The results from this modeling can be used as learning material to understand the seismic activity in the latest 2020 Petrinja, Croatia Earthquake.

주제어

표/그림 (8)

그림 Fig. 1. Petrinja Town location (a) in Croatia (marked with red box) (b) by Sentinel-2 imagery at 20 August 2020 (c) aftermath of the 2020 Mw 6.4 Earthquake in Petrinja (marked with red box in Fig. 1(b)) (Ministry of Internal Affairs of Republic of Croatia, 2020).
표 Table 1. Acquisition date of Sentinel-1 used in this study. Master date are marked with bold color
그림 Fig. 2. Baseline graph of StaMPS process in this study.
그림 Fig. 3. Flowchart of StaMPS processing (modified from (Sousa et al., 2011)).
그림 Fig. 4. Unwrapped InSAR of available SAR data processed in StaMPS. Master images date is 24 December 2020. All images are overlaid with SAR mean amplitude images.
그림 Fig. 5. Result of line-of-sight projected deformation maps from (a) observed InSAR pair generated from 20201224 and 20201230 pair data (b) observed data from StaMPS result (c) modeled result (d) residual result.
그림 Fig. 6. Time-series deformation graph of the study area.
표 Table 2. Source Parameter of Okada model from StaMPS result

AI 본문요약
AI-Helper

대상 데이터

4 occurred and hit central Croatia. The epicenter of the earthquake is located around 5 km southwest of the town of Petrinja. This earthquake devastated the town with a lot of building damaged, at least seven people dead, and many were wounded.

이론/모형

Two-pass InSAR approach is applied to SAR datasets. Those images are being co-registered at sub-pixel accuracy to form the interferometric pair.

성능/효과

The Okada sources are having 11.63 km in length, 2.45 km in width, and 5.46 km in depth with the dip angle are about 84.47° and strike angle are about 142.88° from the north direction
The earthquake that occurred on December 2020 in Petrinja, Croatia had a massive impact not only for the Croatian citizen, but also the neighborhood country such as Slovenia, and Bosnia and Herzegovina
The time-series graph is also showing no significant deformation occurred before the co-seismic event at selected point (Point 1 and Point 2). The predicted result from Okada model is shows that the deformation is mostly dominated by strike-slip with 3 meter deformation as right lateral strike-slip. The Okada sources are having 11.
1 cm per 4 months of acquisition. The time-series graph is also showing no significant deformation occurred before the co-seismic event at selected point (Point 1 and Point 2). The predicted result from Okada model is shows that the deformation is mostly dominated by strike-slip with 3 meter deformation as right lateral strike-slip.
The earthquake that occurred on December 2020 in Petrinja, Croatia had a massive impact not only for the Croatian citizen, but also the neighborhood country such as Slovenia, and Bosnia and Herzegovina. This work has shown that PSI-StaMPS showing better information regarding deformation occurred in the 2020 Mw 6.4 Petrinja, Croatia Earthquake with the mean deformation velocity are about 30 radians or equal with 13.1 cm per 4 months of acquisition. The time-series graph is also showing no significant deformation occurred before the co-seismic event at selected point (Point 1 and Point 2).

후속연구

This result is in an agreement with preliminary report from Croatian Geological Survey (HGI-CGS). Thus, further research and field data collection in order to understand more about this earthquake in order to help authorities and other decision-maker in this region for risk assessment and mitigation plan.

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