5:15 PM - 6:45 PM
[U15-P66] Coseismic displacement at GEONET sites due to the 2024 Noto Peninsula Earthquake in JISLaD (Japanese Information System of Land Deformation)
Keywords:Noto Peninsula Earthquake, GNSS, co-seismic displacement, GEONET
Nippo Co., Ltd. analyzes daily observation data from all GEONET sites, using the IGS sites in and around East Asia as reference sites and applying the GAMIT/GLOBK program and Bernese software. Then obtained daily site coordinate solutions are stored in JISLaD (Japanese Information System of Land Deformation), and their time variations are provided on its website.
This paper presents the coseismic displacements due to the 2024 Noto Peninsula Earthquake detected by applying the GAMIT/GLOBK program of the JISLaD system. In the analysis, we use observation data from December 24 to 30, 2023 before the earthquake, and those from January 2 to 8, 2024 after the earthquake. In JISLaD, all approximately 1300 GEONET sites are divided into 39 groups and the daily coordinate solutions are calculated using the GAMIT program. We apply the GLOBK program to calculate the daily coordinate values of all GEONET sites from the GAMIT daily solutions, and determine coseismic displacements from the daily solutions for 14 days before and after the earthquake by applying GLOBK’s Kalman filter.
On the JISLaD website, horizontal and vertical displacements of the sites are plotted into three maps with different scales: ‘near’ (up to about 60 km from the epicenter), ‘midst’ (up to about 200 km), and ‘far’ (up to about 400 km). Here shows the map of ‘far’ area.
Horizontal coseismic displacements at most GEONET sites are toward the epicenter, consistent with the nearly pure dip-slip focal mechanism derived from seismic wave analysis such as CMT solution. On the other hand, in the vertical component, uplift is seen from the most part of Kanto region to Nagano and Shizuoka prefectures, while subsidence is seen from Gifu and Aichi prefectures to the Kinki region. Both uplift and subsidence are observed north of northern Kanto.
In this presentation, we will compare the horizontal and vertical patterns of coseismic displacements fields in ‘midst’ and ‘far’ observation areas with the displacement patterns estimated from fault models deduced from focal mechanism solutions such as CMT solutions, and also examine whether there are any significant differences between them.
This paper presents the coseismic displacements due to the 2024 Noto Peninsula Earthquake detected by applying the GAMIT/GLOBK program of the JISLaD system. In the analysis, we use observation data from December 24 to 30, 2023 before the earthquake, and those from January 2 to 8, 2024 after the earthquake. In JISLaD, all approximately 1300 GEONET sites are divided into 39 groups and the daily coordinate solutions are calculated using the GAMIT program. We apply the GLOBK program to calculate the daily coordinate values of all GEONET sites from the GAMIT daily solutions, and determine coseismic displacements from the daily solutions for 14 days before and after the earthquake by applying GLOBK’s Kalman filter.
On the JISLaD website, horizontal and vertical displacements of the sites are plotted into three maps with different scales: ‘near’ (up to about 60 km from the epicenter), ‘midst’ (up to about 200 km), and ‘far’ (up to about 400 km). Here shows the map of ‘far’ area.
Horizontal coseismic displacements at most GEONET sites are toward the epicenter, consistent with the nearly pure dip-slip focal mechanism derived from seismic wave analysis such as CMT solution. On the other hand, in the vertical component, uplift is seen from the most part of Kanto region to Nagano and Shizuoka prefectures, while subsidence is seen from Gifu and Aichi prefectures to the Kinki region. Both uplift and subsidence are observed north of northern Kanto.
In this presentation, we will compare the horizontal and vertical patterns of coseismic displacements fields in ‘midst’ and ‘far’ observation areas with the displacement patterns estimated from fault models deduced from focal mechanism solutions such as CMT solutions, and also examine whether there are any significant differences between them.