北海道地方の地殻変動

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1 Crustal Movements in the Hokkaido District Geographical Survey Institute

3 997// - // 8//7-8// 8//7-8// km 5 cm 3/9/ M8. //9 M Fig.a Horizontal crustal movement in Hokkaido after removing the linear trend and one year cycle and half-year cycle variation components. (January 8 to April 8) 997// - // km 5 3/9/ M8. //9 M7. 8/3/7-8/3/ 8//7-8// cm Fig.b Horizontal crustal movement in Hokkaido after removing the linear trend and one year cycle and half-year cycle variation components. (March 8 to April 8) Fig. Results of Continuous GPS Measurements along the eastern region and the Pacific coast of Hokkaido: Site location map and records of the maintenance of those sites.

4 Fig. 3 Results of Continuous GPS Measurements along the eastern region and the Pacific coast of Hokkaido: (corrected time series data removing linear trend referred to Iwasaki) (/)

5 Fig. Results of Continuous GPS Measurements along the eastern region and the Pacific coast of Hokkaido: (corrected time series data removing linear trend referred to Iwasaki) (/)

6 Fig. 5 Results of Continuous GPS Measurements along the eastern region and the Pacific coast of Hokkaido: (corrected time series data removing linear trend referred to Iwasaki) (3/)

7 Fig. Results of Continuous GPS Measurements along the eastern region and the Pacific coast of Hokkaido: (corrected time series data removing linear trend referred to Iwasaki) (/)

8 Fig. 7 Crustal movement velocity change at GEONET sites along the Pacific coast of Hokkaido (Time series at Erimo site).

9 Fig. 8 Crustal movement velocity change at GEONET sites along the Pacific coast of Hokkaido (Time series at Nemuro- site).

10 //8 8/5/ (3) 5cm Fig. 9a Slip on the plate boundary in eastern Hokkaido estimated by time dependent inversion after the Off-Kushiro earthquake on December, (Slip vector map). x 8 Nm 5 3 //8 8/5/ Whole region Urakawa region (3) Tokachi region Kushiro region / / Mw7.7 Mw7. Mw7.5 Mw7. Mw7.3 Mw7. Mw7. Fig. 9b Slip on the plate boundary in eastern Hokkaido estimated by time dependent inversion after the Off-Kushiro earthquake on December, (Time series of released moment).

11 //8 5//7 //8 5//7 //8 5// cm obs calc cm cm obs calc //7 //7 5//7 //7 5//7 // cm obs calc cm cm obs calc (3) //7 7//8 (3) //7 7//8 (3) //7 7// cm obs calc cm cm obs calc /5/ 8/5/ 7/5/ 8/5/ 7/5/ 8/5/ cm obs calc cm cm obs calc Fig. Slip on the plate boundary in eastern Hokkaido estimated by time dependent inversion by every years after the Off-Kushiro earthquake on December,, and comparison of horizontal and vertical components between observation and the calculation.

12 95 95 //8 8/5/ / / 7/ 8/ 9/ 5/ / 7/ 8/ 9/ 5/ / 7/ 8/ 9/ / / 7/ 8/ 9/ 5/ / 7/ 8/ 9/ 5/ / 7/ 8/ 9/ Fig. Time series of observed crustal movement compared with estimated movement by the slow slip model after the Off-Kushiro earthquake. (/3)

13 //8 8/5/ / / 7/ 8/ 9/ 5/ / 7/ 8/ 9/ 5/ / 7/ 8/ 9/ / / 7/ 8/ 9/ 5/ / 7/ 8/ 9/ 5/ / 7/ 8/ 9/ / / 7/ 8/ 9/ 95 5/ / 7/ 8/ 9/ 5/ / 7/ 8/ 9/ / / 7/ 8/ 9/ 5/ / 7/ 8/ 9/ 5/ / 7/ 8/ 9/ Fig. Time series of observed crustal movement compared with estimated movement by the slow slip model after the Off-Kushiro earthquake. (/3)

14 //8 8/5/ / / 7/ 8/ 9/ 5/ / 7/ 8/ 9/ 5/ / 7/ 8/ 9/ / / 7/ 8/ 9/ 5/ / 7/ 8/ 9/ / / 7/ 8/ 9/ 5/ / 7/ 8/ 9/ 5/ / 7/ 8/ 9/ Fig. 3 Time series of observed crustal movement compared with estimated movement by the slow slip model after the Off-Kushiro earthquake. (3/3)

15 km ( 7 ) ( - ) km ( 7 ) ( ) - (3) - () - - () () (-) - - () 3 () () - () - () () (3) - - () () - () - () - 3 () - () - () () - () - (3) () 3 () (-) () -7 (5) (3) () - () - () () () () 7 () - (3) () 8 () 9 [ x - ] ( ) [ x - ] 5 5 ( ) Fig. Crustal horizontal strain of Sapporo and Asahikawa district calculated from geodetic survey results. (/)

16 km 5 (5) 5 (5) -7 () 5 (5) ( 7 ) ( 983 ) () - (5) () () () (9) -7 () 3 () -9 () 9 (3) () 3 () () () - () () 7 () - () () () () 3 () - () - () () () - (-) - - (8) () km () () 5 (8) () ( 7 ) ( 99 ) 7 (5) () (7) () 7 () () (5) (7) (7) (-) (8) (7) 9 (9) 9 () () 9 (5) (-7) () 9 (-) 8 () () 7 (-) () (-) (3) () (-7) () 5 (-8) 7 () 9 () 9 () (8) 8 () 9 () (-8) () () (-) - () () - (-9) 3 () 8 () 8 () 7 () 8 () (-) () () (-7) -8 - () 5 (-) [ x - ] ( ) -7 () (5) (9) [ x - ] ( ) Fig. 5 Crustal horizontal strain of Sapporo and Asahikawa district calculated from geodetic survey results. (/)

９－２西南日本における短期的スロースリップイベント(2008年11月～2009年4月)

９－２西南日本における短期的スロースリップイベント(2008年11月～2009年4月) (2008 11 2009 4 ) Short-term slow slip event with non-volcanic tremors in southwest Japan (November, 2008 April, 2009) National Research Institute for Earth Science and Disaster Prevention (SSE) 1, 2)