震源座標の関数としての観測点補正値を用いた震源決定方法

• 古川 信雄

  建設省建築研究所

• 大見 士朗

  防災科学技術研究所

書誌事項

タイトル別名

• A Hypocenter-Determination Method Using Station Corrections as a Function of Hypocenter Coordinates
• シンゲン ザヒョウ ノ カンスウ トシテノ カンソクテン ホセイチ オ モチイ

抄録

A simple method to determine hypocenters of earthquakes taking account of a lateral heterogeneity of the Earth is proposed. In this method we calculate a hypocenter using station corrections as a function of hypocenter coordinates (x, y, z). The lateral heterogeneity is corrected by these station corrections. We assume that station correction SC_j at a j-th station is represented as follows: SC_j=a_j+b_jx+c_jy+d_jz+e_jxy+f_jyz+g_jzx+h_jx²+k_jy²+l_jz². Where a_j, b_j, …, l_j are constant.<br>Coefficients a_j, b_j, …, l_j are obtained as follows: Dividing a whole region into many sub-regions, we relocate earthquakes in each sub-region by the method of joint hypocenter determination. We regard station corrections obtained in this sub-region as those at the center of the sub-region. Obtaining station corrections at all sub-regions, we interporate them by a function that is a quadratic form of x, y and z. Station correction SC_ij at the j-th station obtained at the i-th sub-region is represented as follows: SC_ij=a_j+b_jx_i+c_jy_i+d_jz_i+e_jx_iy_i+f_jy_iz_i+g_jz_ix_i+h_jx_i²+k_jy_i²+l_jz_i². Where x_i y_i and z_i are x, y and z coordinates of the center of the i-th sub-region, respectively.<br>Obtaining station corrections at 41 stations of the Kanto network of the National Research Institute for Earth Science and Disaster Prevention, we relocated earthquakes in the Kanto district. Since the effect of the lateral heterogeity is taken account of, there is no magnitude dependence of hypocenters, which obscures spacial distribution of earthquakes determined by the previous method. We can obtain a fine distribution map of hypocenters.

収録刊行物

• 地震　第２輯

  地震　第２輯 46 (3), 285-295, 1993

  公益社団法人 日本地震学会

キーワード

• Hypocenter determination
• Station correction
• Kanto district

詳細情報

• CRID: 1390282679283314304
• NII論文ID: 10006221125
• NII書誌ID: AN00305741
• DOI: 10.4294/zisin1948.46.3_285
• ISSN: 18839029
• ISSN: 2186599X
• ISSN: 00371114
• NDL書誌ID: 3847835
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3847835
• Web Site: https://www.jstage.jst.go.jp/article/zisin1948/46/3/46_3_285/_pdf
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