Relocation of the 17 June 2017 Nuugaatsiaq (Greenland) Landslide Based on Green's Functions From Ambient Seismic Noises

Abstract

Landslide is one of the most dangerous geological hazards in mountainous regions, which causes large casualties. Fast and accurate location of a landslide is critical to disaster mitigation and early warning of secondary hazards. The landslide location is a difficult problem in a remote region with sparse seismic network due to low resolution of the velocity structure model. Green's functions from ambient seismic noises can be used to calibrate effects due to the uncertainty of velocity structure. In this study, we relocate a large landslide occurred in Nuugaatsiaq, Greenland, on 17 June 2017 using relative location method based on Green's functions from ambient seismic noises. The location result of the landslide is about 2.5 km away from the site given by satellite image. This is better than the result based on traditional location method, which has a deviation up to ~17 km. Our result demonstrates that this algorithm can provide accurate location of landslide with seismographic stations in global and regional networks, thus providing timely assistance to early warning of secondary hazards.

A Reciprocity‐Based Efficient Method for Improved Source Parameter Estimation of Submarine Earthquakes With Hybrid 3‐D Teleseismic Green's Functions

“…This method uses NCF between a remote station and a local station near the target earthquake to calibrate 3‐D path effects, which are the main source of error in the relocation (see Supporting Information S1). Depending on the quality of the NCF and the frequency used, the estimated centroid location can be accurate to within a few kilometers (Xie et al., 2020). We download 1‐year continuous waveform data from OBSs and other land stations in the western United States.…”

“…This method uses NCF between a remote station and a local station near the target earthquake to calibrate 3-D path effects, which are the main source of error in the relocation (see Supporting Information S1). Depending on the quality of the NCF and the frequency used, the estimated centroid location can be accurate to within a few kilometers (Xie et al, 2020). We download 1-year By fitting the cosine-shape differential travel time between the Rayleigh waves of the NCFs and EQ2013 as a function of azimuths (Figure 6b), the centroid location of EQ2013 is estimated to be 127.84°W/43.46°N (Figure 6a), which is about 3 km away from the hypocenter of 127.867°W/43.476°N.…”

A Joint Seismic and Space‐Based Investigation of the 2016 Lamplugh Glacier and 2017 Wrangell Mountains (Alaska) Landslides

“…Seismic observations have shown promise in identifying landslides (Ekström, 2006; W. Fan et al., 2020; Manconi et al., 2016; Xie et al., 2020) and resolving landslide dynamics (Brodsky et al., 2003; Intrieri et al., 2018; Kanamori & Given, 1982; Lai et al., 2018; Poli, 2017). Fast‐moving landslides can generate seismic signals from short‐period (≥1 Hz; Doi & Maeda, 2020; Hibert et al., 2011; Yamada et al., 2012) to intermediate and long‐period motion (≤0.1 Hz; Allstadt, 2013; Kanamori & Given, 1982; Eissler & Kanamori, 1987).…”

Using high-precision travel time extraction to detect time deviation of seismic instruments

“…The quality of seismic data is the basis of quantitative research in seismology. In recent years, a large amount of seismic ambient data obtained through dense networks has been used in high-precision tomography (Nakata et al 2015, Wang et al 2019 and landslide location (Xie et al 2020) and other fields. Specifically, the precision and synchronization of chronometers constitute indispensable prerequisites for these scientific investigations.…”