Pub Date : 2022-10-25DOI: 10.5026/jgeography.131.479
Y. Fukahata, Tomohisa Okazaki, T. Nishimura
― ― Abstract How to estimate a strainrate field from spatially discrete geodetic data has been a long standing issue. In this paper, a method based on basis function expansion with Akaike’s Bayes ian information criterion （ ABIC ） is introduced, by which strainrate fields can be obtained objec tively and stably. By applying the method to GNSS data in Japan, strainrate fields are obtained for three periods: 1997 1999, 2006 2009, and 2017 2020. Except for deformation related to volcanic activity and large earthquakes, the obtained strainrate fields are roughly stationary in time, while showing large variations in space. In order to interpret such spatially heterogeneous deformation, a framework of interarc and intraarc deformation is used, considering Japanese Islands to be composed of five island arcs （ Kuril, northeast Japan, west Japan, Izu Bonin, and Ryukyu ） and that these island arcs are defined with little ambiguity, though the northeast and westJapan arcs are collectively treated as the Honshu arc in this study. Interarc deformation between the Kuril and Honshu arcs is characterized by EW contraction, the Izu Bonin and Honshu arcs by NS to NW SE contraction, and the Ryukyu and Honshu arcs by NS extension with EW contraction. Regarding intraarc deformation, the Kuril arc shows high strain rates from the Pacific coast to the back of the volcanic arc, the northernmost part of the Izu Bonin arc shows significant EW to NE SW extension, and the Ryukyu arc shows NS extension with EW contraction similar to the interarc deformation with the Honshu arc, although the EW contrac tion is weaker to the south. The Honshu arc shows zones of high strain rates along the eastern margin of the Japan Sea via the Niigata Kobe tectonic zone （ NKTZ ） to the Median Tectonic Line and along the Oubackbone Range, while it also shows low strain rates in the Chugoku district and in the zone from northern Ibaraki prefecture via the northern Kanto district to northern Aichi prefecture, which is named the Hitachi Mikawa forearc low strainrate zone （ HMLSZ ） .
{"title":"Strain-rate Field of Japan Estimated from GNSS Data and Its Interpretation Based on Inter- and Intra-arc Deformation","authors":"Y. Fukahata, Tomohisa Okazaki, T. Nishimura","doi":"10.5026/jgeography.131.479","DOIUrl":"https://doi.org/10.5026/jgeography.131.479","url":null,"abstract":"― ― Abstract How to estimate a strainrate field from spatially discrete geodetic data has been a long standing issue. In this paper, a method based on basis function expansion with Akaike’s Bayes ian information criterion （ ABIC ） is introduced, by which strainrate fields can be obtained objec tively and stably. By applying the method to GNSS data in Japan, strainrate fields are obtained for three periods: 1997 1999, 2006 2009, and 2017 2020. Except for deformation related to volcanic activity and large earthquakes, the obtained strainrate fields are roughly stationary in time, while showing large variations in space. In order to interpret such spatially heterogeneous deformation, a framework of interarc and intraarc deformation is used, considering Japanese Islands to be composed of five island arcs （ Kuril, northeast Japan, west Japan, Izu Bonin, and Ryukyu ） and that these island arcs are defined with little ambiguity, though the northeast and westJapan arcs are collectively treated as the Honshu arc in this study. Interarc deformation between the Kuril and Honshu arcs is characterized by EW contraction, the Izu Bonin and Honshu arcs by NS to NW SE contraction, and the Ryukyu and Honshu arcs by NS extension with EW contraction. Regarding intraarc deformation, the Kuril arc shows high strain rates from the Pacific coast to the back of the volcanic arc, the northernmost part of the Izu Bonin arc shows significant EW to NE SW extension, and the Ryukyu arc shows NS extension with EW contraction similar to the interarc deformation with the Honshu arc, although the EW contrac tion is weaker to the south. The Honshu arc shows zones of high strain rates along the eastern margin of the Japan Sea via the Niigata Kobe tectonic zone （ NKTZ ） to the Median Tectonic Line and along the Oubackbone Range, while it also shows low strain rates in the Chugoku district and in the zone from northern Ibaraki prefecture via the northern Kanto district to northern Aichi prefecture, which is named the Hitachi Mikawa forearc low strainrate zone （ HMLSZ ） .","PeriodicalId":45817,"journal":{"name":"Journal of Geography-Chigaku Zasshi","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45246973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-25DOI: 10.5026/jgeography.131.497
Takeshi Yoshida, Osamu Kazaoka, T. Kusuda, K. Furuno, A. Kagawa
{"title":"Relationship between Water Color in Tidal Pools and Groundwater Flow on Foreshore, Kujukuri Beach, Chiba, Central Japan","authors":"Takeshi Yoshida, Osamu Kazaoka, T. Kusuda, K. Furuno, A. Kagawa","doi":"10.5026/jgeography.131.497","DOIUrl":"https://doi.org/10.5026/jgeography.131.497","url":null,"abstract":"","PeriodicalId":45817,"journal":{"name":"Journal of Geography-Chigaku Zasshi","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47259971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-25DOI: 10.5026/jgeography.131.545
M. Nogami
M. Hoyanagi pointed out a position deviation of Kyushu Island on an Inoh map with a scale of 1 to 216000. He explained it referring to the map projection adopted by Inoh and the magnetic declination at the beginning of 19 th century. In this study, the correlation between the coordinate value of an astronomical observation point on the map and the corresponding location （ latitude and longitude ） on the actual map is statistically analyzed. The coefficients of determination （ R 2 ） are calculated for maps rotated by small degrees. As a result, anticlockwise rotation of the map by 0.975 degree gave the max value of R 2 （ 0.9995 ） . This value corresponds to a magnetic declination of about 1.0 degree to the west at that time in the central region of Kyushu Island. It is concluded that the position deviation on the map is caused by magnetic declination, because Inoh considered magnetic north to be true north when surveying and mapping.
{"title":"Geographical Position of Kyushu Island on Inoh Map and Magnetic Declination","authors":"M. Nogami","doi":"10.5026/jgeography.131.545","DOIUrl":"https://doi.org/10.5026/jgeography.131.545","url":null,"abstract":"M. Hoyanagi pointed out a position deviation of Kyushu Island on an Inoh map with a scale of 1 to 216000. He explained it referring to the map projection adopted by Inoh and the magnetic declination at the beginning of 19 th century. In this study, the correlation between the coordinate value of an astronomical observation point on the map and the corresponding location （ latitude and longitude ） on the actual map is statistically analyzed. The coefficients of determination （ R 2 ） are calculated for maps rotated by small degrees. As a result, anticlockwise rotation of the map by 0.975 degree gave the max value of R 2 （ 0.9995 ） . This value corresponds to a magnetic declination of about 1.0 degree to the west at that time in the central region of Kyushu Island. It is concluded that the position deviation on the map is caused by magnetic declination, because Inoh considered magnetic north to be true north when surveying and mapping.","PeriodicalId":45817,"journal":{"name":"Journal of Geography-Chigaku Zasshi","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45989150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-25DOI: 10.5026/jgeography.131.407
Satoshi Yoshida, Y. Isozaki, Tomohito Nakano, Y. Tsutsumi
{"title":"Western End of Late Cretaceous Fore-arc Basin and Provenance in SW Japan: Detrital Zircon U–Pb Dating of Upper Cretaceous–Paleogene Sandstones in Nagasaki-Nishisonogi Peninsula, Western Kyushu","authors":"Satoshi Yoshida, Y. Isozaki, Tomohito Nakano, Y. Tsutsumi","doi":"10.5026/jgeography.131.407","DOIUrl":"https://doi.org/10.5026/jgeography.131.407","url":null,"abstract":"","PeriodicalId":45817,"journal":{"name":"Journal of Geography-Chigaku Zasshi","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43323075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-25DOI: 10.5026/jgeography.131.463
J. Iwahashi, Akinobu Ando, Y. Nishioka, D. Kawabata, Takahisa Shiraishi
{"title":"Developing Teaching Materials on the Geology of the Kamisugi Area in Sendai City Using the Computer Game Minecraft","authors":"J. Iwahashi, Akinobu Ando, Y. Nishioka, D. Kawabata, Takahisa Shiraishi","doi":"10.5026/jgeography.131.463","DOIUrl":"https://doi.org/10.5026/jgeography.131.463","url":null,"abstract":"","PeriodicalId":45817,"journal":{"name":"Journal of Geography-Chigaku Zasshi","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46768518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-25DOI: 10.5026/jgeography.131.447
Y. Kariya, S. Harayama, Y. Matsushi, Yusuke Shimizu, H. Matsuzaki
{"title":"Blockslopes Caused by Large to Meso-scale Rock Slope Failures in the Upper Okumatajirodani Valley on the Eastern Side of Mount Maehotaka-dake North Ridge, Northern Japanese Alps","authors":"Y. Kariya, S. Harayama, Y. Matsushi, Yusuke Shimizu, H. Matsuzaki","doi":"10.5026/jgeography.131.447","DOIUrl":"https://doi.org/10.5026/jgeography.131.447","url":null,"abstract":"","PeriodicalId":45817,"journal":{"name":"Journal of Geography-Chigaku Zasshi","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46854502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-25DOI: 10.5026/jgeography.131.473
K. Omoto, A. Ikeda, Y. Yokoo
{"title":"Radiocarbon Measurements of Samples Collected from Conglomeratic Beachrock Developing at Higashihama-cho, Sasebo, Nagasaki Prefecture","authors":"K. Omoto, A. Ikeda, Y. Yokoo","doi":"10.5026/jgeography.131.473","DOIUrl":"https://doi.org/10.5026/jgeography.131.473","url":null,"abstract":"","PeriodicalId":45817,"journal":{"name":"Journal of Geography-Chigaku Zasshi","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70685097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-25DOI: 10.5026/jgeography.131.427
Naoko Nagumo, S. Egashira
{"title":"Multi-decadal Landform Evolution in the Sittaung River Estuary, Myanmar","authors":"Naoko Nagumo, S. Egashira","doi":"10.5026/jgeography.131.427","DOIUrl":"https://doi.org/10.5026/jgeography.131.427","url":null,"abstract":"","PeriodicalId":45817,"journal":{"name":"Journal of Geography-Chigaku Zasshi","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48518702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-25DOI: 10.5026/jgeography.131.393
Yihui Yang, K. Ueno
{"title":"Monitoring Mountain Weather Variabilities Based on Decadal Observations of the Present Weather Sensor in the Highland of Central Japan","authors":"Yihui Yang, K. Ueno","doi":"10.5026/jgeography.131.393","DOIUrl":"https://doi.org/10.5026/jgeography.131.393","url":null,"abstract":"","PeriodicalId":45817,"journal":{"name":"Journal of Geography-Chigaku Zasshi","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48356461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-25DOI: 10.5026/jgeography.131.cover04_01
{"title":"“Herd-like Landforms (Gyugun Tikei)” in Tokyo","authors":"","doi":"10.5026/jgeography.131.cover04_01","DOIUrl":"https://doi.org/10.5026/jgeography.131.cover04_01","url":null,"abstract":"","PeriodicalId":45817,"journal":{"name":"Journal of Geography-Chigaku Zasshi","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47594452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：