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Overestimation of magnitude by as much as 0.5 to 1.5 magnitude units in the epicentral distance ranging between 5° and 13° relative to the magnitude at teleseismic distances shows that the zone of low amplitude signals predicted by Gutenberg and Richter (1956) in that distance range does not exist as a worldwide phenomenon. Available distance range of the calibrating function Q(A) provided by Gutenberg and Richter as a worldwide standard should be limited to the distance range of more than 20°. Regional correction factor as a function of epicentral distance subtractive from the calibrating function Q(⊿) are calculated for the five reference stations, College/Alaska, Tonto Forest/Arizona, Caracas/Venezuela, Port Moresby/New Guinea and Rabaul/New Britain Island.|Gutenberg-Richter(1956)によってあたえられたQ -functionが震央距離⊿≥30°でのP波の振巾と⊿との関係をあたえるよい近似関数であることは観測および理論からたしかめられている.しかしあさい震源(H≤50km)をもつ地震のマグニチュードmpzが⊿≥30°できめられたものと⊿\u003c30°できめられたものとでは顕著な相違を示す場合がある.これはQ -functionが⊿\u003c30°ではかならずしもP波の振巾と⊿との関係をあたえるよい近似関数ではないことをしめしている.特に地域によって5゜≤⊿\u003cく13°できめられたmpzが⊿≥30°できめられたmpzと比較して,0.5ないし1.5程度おゝきくみつもられる傾向があるという事実は,Q -functionによってあたえられる⊿=10゜近傍のP波の振巾が極度にちいさくみつもられすぎていることに対応する.", "subitem_description_type": "Abstract"}]}, "item_4_full_name_3": {"attribute_name": "著者別名", "attribute_value_mlt": [{"nameIdentifiers": [{"nameIdentifier": "130544", "nameIdentifierScheme": "WEKO"}], "names": [{"name": "溝上, 恵"}]}]}, "item_4_identifier_registration": {"attribute_name": "ID登録", "attribute_value_mlt": [{"subitem_identifier_reg_text": "10.15083/0000033432", "subitem_identifier_reg_type": "JaLC"}]}, "item_4_publisher_20": {"attribute_name": "出版者", "attribute_value_mlt": [{"subitem_publisher": "東京大学地震研究所"}]}, "item_4_source_id_10": {"attribute_name": "書誌レコードID", "attribute_value_mlt": [{"subitem_source_identifier": "AN00162258", "subitem_source_identifier_type": "NCID"}]}, "item_4_source_id_8": {"attribute_name": "ISSN", "attribute_value_mlt": [{"subitem_source_identifier": "00408972", "subitem_source_identifier_type": "ISSN"}]}, "item_4_subject_15": {"attribute_name": "日本十進分類法", "attribute_value_mlt": [{"subitem_subject": "453", "subitem_subject_scheme": "NDC"}]}, "item_4_text_21": {"attribute_name": "出版者別名", "attribute_value_mlt": [{"subitem_text_value": "Earthquake Research Institute, University of Tokyo"}]}, "item_4_text_34": {"attribute_name": "資源タイプ", "attribute_value_mlt": [{"subitem_text_value": "Departmental Bulletin Paper"}]}, "item_4_text_4": {"attribute_name": "著者所属", "attribute_value_mlt": [{"subitem_text_value": "Earthquake Research Institute"}]}, "item_creator": {"attribute_name": "著者", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "Mizoue, Megumi"}], "nameIdentifiers": [{"nameIdentifier": "130543", "nameIdentifierScheme": "WEKO"}]}]}, "item_files": {"attribute_name": "ファイル情報", "attribute_type": "file", "attribute_value_mlt": [{"accessrole": "open_date", "date": [{"dateType": "Available", "dateValue": "2017-06-26"}], "displaytype": "detail", "download_preview_message": "", "file_order": 0, "filename": "ji0463002.pdf", "filesize": [{"value": "1.6 MB"}], "format": "application/pdf", "future_date_message": "", "is_thumbnail": false, "licensetype": "license_free", "mimetype": "application/pdf", "size": 1600000.0, "url": {"label": "ji0463002.pdf", "url": "https://repository.dl.itc.u-tokyo.ac.jp/record/33432/files/ji0463002.pdf"}, "version_id": "010e4fb1-cade-46ad-a016-4013afbe5e15"}]}, "item_language": {"attribute_name": "言語", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_resource_type": {"attribute_name": "資源タイプ", "attribute_value_mlt": [{"resourcetype": "departmental bulletin paper", "resourceuri": "http://purl.org/coar/resource_type/c_6501"}]}, "item_title": "22. Earthquake Magnitude Determination in relation to Regional Variations of P wave Amplitudes Part 1", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "22. Earthquake Magnitude Determination in relation to Regional Variations of P wave Amplitudes Part 1", "subitem_title_language": "en"}]}, "item_type_id": "4", "owner": "1", "path": ["4921", "4922"], "permalink_uri": "https://doi.org/10.15083/0000033432", "pubdate": {"attribute_name": "PubDate", "attribute_value": "2008-05-30"}, "publish_date": "2008-05-30", "publish_status": "0", "recid": "33432", "relation": {}, "relation_version_is_last": true, "title": ["22. Earthquake Magnitude Determination in relation to Regional Variations of P wave Amplitudes Part 1"], "weko_shared_id": -1}
22. Earthquake Magnitude Determination in relation to Regional Variations of P wave Amplitudes Part 1
https://doi.org/10.15083/0000033432
https://doi.org/10.15083/0000033432746a9f1c-ad50-4954-8f9d-748d18640162
名前 / ファイル | ライセンス | アクション |
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ji0463002.pdf (1.6 MB)
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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公開日 | 2008-05-30 | |||||
タイトル | ||||||
タイトル | 22. Earthquake Magnitude Determination in relation to Regional Variations of P wave Amplitudes Part 1 | |||||
言語 | en | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15083/0000033432 | |||||
ID登録タイプ | JaLC | |||||
その他のタイトル | ||||||
その他のタイトル | 22.P波の振巾の地域性とマグニチュードの決定について(1) | |||||
言語 | ja | |||||
著者 |
Mizoue, Megumi
× Mizoue, Megumi |
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著者別名 | ||||||
識別子 | 130544 | |||||
識別子Scheme | WEKO | |||||
姓名 | 溝上, 恵 | |||||
著者所属 | ||||||
著者所属 | Earthquake Research Institute | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Body wave magnitude mpz in EDR (Earthquake Data Report) of USCGS for earthquakes with shallow forcal depth (H≤50km) determined at near and regional epicentral distances (5°≤⊿<30°) deviates significantly from the magnitude of the same events determined at teleseismic distances ⊿≥30°). Overestimation of magnitude by as much as 0.5 to 1.5 magnitude units in the epicentral distance ranging between 5° and 13° relative to the magnitude at teleseismic distances shows that the zone of low amplitude signals predicted by Gutenberg and Richter (1956) in that distance range does not exist as a worldwide phenomenon. Available distance range of the calibrating function Q(A) provided by Gutenberg and Richter as a worldwide standard should be limited to the distance range of more than 20°. Regional correction factor as a function of epicentral distance subtractive from the calibrating function Q(⊿) are calculated for the five reference stations, College/Alaska, Tonto Forest/Arizona, Caracas/Venezuela, Port Moresby/New Guinea and Rabaul/New Britain Island.|Gutenberg-Richter(1956)によってあたえられたQ -functionが震央距離⊿≥30°でのP波の振巾と⊿との関係をあたえるよい近似関数であることは観測および理論からたしかめられている.しかしあさい震源(H≤50km)をもつ地震のマグニチュードmpzが⊿≥30°できめられたものと⊿<30°できめられたものとでは顕著な相違を示す場合がある.これはQ -functionが⊿<30°ではかならずしもP波の振巾と⊿との関係をあたえるよい近似関数ではないことをしめしている.特に地域によって5゜≤⊿<く13°できめられたmpzが⊿≥30°できめられたmpzと比較して,0.5ないし1.5程度おゝきくみつもられる傾向があるという事実は,Q -functionによってあたえられる⊿=10゜近傍のP波の振巾が極度にちいさくみつもられすぎていることに対応する. | |||||
書誌情報 |
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo 巻 46, 号 3, p. 457-484, 発行日 1968-07-25 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 00408972 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AN00162258 | |||||
フォーマット | ||||||
内容記述タイプ | Other | |||||
内容記述 | application/pdf | |||||
日本十進分類法 | ||||||
主題 | 453 | |||||
主題Scheme | NDC | |||||
出版者 | ||||||
出版者 | 東京大学地震研究所 | |||||
出版者別名 | ||||||
Earthquake Research Institute, University of Tokyo |