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[SGD02-P17] Comparison of non-stationary crustal deformation vector diagrams using F5 solution
Keywords:crustal deformation, F5 solution, GEONET
In recent years, large earthquakes and volcanic eruptions have frequently occurred around the world. The Southeastern Turkey Earthquake (2023.2.6) and the large eruption of a submarine volcano off the coast of Tonga (20221.15) have occurred. Even in Japan, the risk of a Nankai Trough earthquake, an eruption of Mt. Fuji, or an earthquake directly hitting the capital is increasing. In order to detect the occurrence of a huge earthquake as soon as possible, Japan has GNSS Earth Observation Network System (GEONET), a High Sensitivity Seismograph Network (Hi-net), and Dense Oceanfloor Network system for Earthquakes and Tsunamis (DONET). Crustal deformation of the Japan arc has been continuously observed. Information obtained from these observation networks is open to the public, and anyone can think about crustal deformation, seismic activity, and volcanic activity in the Japan arc.
Among them, GEONET observes the coordinate values daily and publishes the analytical solution (F5) obtained by its own analysis. The F5 solution is a newly released analytical solution in 2021. Although, there is no major change from the F3 solution that has been released so far, it is reported that the variation in the height component has been improved. It can be said that it is one of the important information for understanding crustal deformation.
Movement vector diagrams are mainly used to capture crustal deformation, and it is common to set arbitrary fixed stations when drawing movement vectors. On the Geospatial Information Authority of Japan website, it is possible to grasp the latest crustal movement information in the form of movement vector diagrams, and anyone can grasp the state of the latest crustal deformation. However, movement vector diagrams have the drawback that if the fixed station is changed, the state of crustal deformation changes greatly making it difficult to interpret what kind of crustal movement occurred. Therefore, we tried to draw the crustal deformation by displaying the vector by the difference value of the observation period of each observation point without setting the fixed station. With this, the movement vector diagram can be regarded as one movement vector regardless of the fixed station.
In addition, when the period for analyzing the movement vector diagram was changed (7 days, 10 days, 30 days, 1 year, etc. for the average coordinate value), changes in the movement vector were observed depending on how the average coordinate value was taken. When considering crustal deformation, not only the deformation vector but also the time-series graph of each observation point is used as important information. By changing the coordinate value average of the movement vector, it may be possible to capture not only periodic movement at each observation point but also unsteady crustal deformation, earthquakes and volcanic activity. This study, using F5 solution regretted by the Geospatial Information Authority of Japan, we compared the change in the movement vector diagram seen when the coordinate averaging period was changed and what kind of crustal deformation can be captured.
Coordinate data that record daily crustal deformation of the Japanese arc contains movements due to various factors, such as movements, plate movements, earth tides, non-stationary movements associated with earthquakes and volcanic activity, and human-induced movements recorded. Interpreting what the movements contained in the coordinate data means it is extremely important not only for understanding crustal deformation in the Japanese arc, but also for interpreting the occurrence of natural phenomena such as huge earthquakes and volcanic activity. By capturing and comparing the coordinate value data from various viewpoints, it will help us understand the crustal deformation of the Japanese arc.
Among them, GEONET observes the coordinate values daily and publishes the analytical solution (F5) obtained by its own analysis. The F5 solution is a newly released analytical solution in 2021. Although, there is no major change from the F3 solution that has been released so far, it is reported that the variation in the height component has been improved. It can be said that it is one of the important information for understanding crustal deformation.
Movement vector diagrams are mainly used to capture crustal deformation, and it is common to set arbitrary fixed stations when drawing movement vectors. On the Geospatial Information Authority of Japan website, it is possible to grasp the latest crustal movement information in the form of movement vector diagrams, and anyone can grasp the state of the latest crustal deformation. However, movement vector diagrams have the drawback that if the fixed station is changed, the state of crustal deformation changes greatly making it difficult to interpret what kind of crustal movement occurred. Therefore, we tried to draw the crustal deformation by displaying the vector by the difference value of the observation period of each observation point without setting the fixed station. With this, the movement vector diagram can be regarded as one movement vector regardless of the fixed station.
In addition, when the period for analyzing the movement vector diagram was changed (7 days, 10 days, 30 days, 1 year, etc. for the average coordinate value), changes in the movement vector were observed depending on how the average coordinate value was taken. When considering crustal deformation, not only the deformation vector but also the time-series graph of each observation point is used as important information. By changing the coordinate value average of the movement vector, it may be possible to capture not only periodic movement at each observation point but also unsteady crustal deformation, earthquakes and volcanic activity. This study, using F5 solution regretted by the Geospatial Information Authority of Japan, we compared the change in the movement vector diagram seen when the coordinate averaging period was changed and what kind of crustal deformation can be captured.
Coordinate data that record daily crustal deformation of the Japanese arc contains movements due to various factors, such as movements, plate movements, earth tides, non-stationary movements associated with earthquakes and volcanic activity, and human-induced movements recorded. Interpreting what the movements contained in the coordinate data means it is extremely important not only for understanding crustal deformation in the Japanese arc, but also for interpreting the occurrence of natural phenomena such as huge earthquakes and volcanic activity. By capturing and comparing the coordinate value data from various viewpoints, it will help us understand the crustal deformation of the Japanese arc.