Characteristics of Adobe Structure Damage observed in Iran-Bam Earthquake (Dec. 26, 2003)

特集2 耐震構造学研究グループ (ERS

2003年12月26日バム地震によって亀裂電柱に残留したひずみと家屋被害

The Bam earthquake of December 26, 2003 (Mw6.5) occurred around the city of Bam in southeast Iran. Because the earthquake happened early in the morning at 01: 56: 56 (GMT, 05: 26: 26 local time), most of the reported 43,100 victims were killed in their dwellings. In Iran, there are dense strong ground motion networks for describing the seismological features of earthquakes, but very sparse networks for damage distribution analysis. Actually, damage differed from street block to street block, and only one seismometer was available in the city. Measuring traces of intense shakes remaining in structures, which are seen everywhere and have common features, can be very effective. The authors used utility poles in Bam for this structure. This report provides a spatial distribution of strains induced in these poles, and compares them with damage distribution in the city

Verification of Early Impacted Area Estimation Method Using DMSP/OLS Night-time Imagery on the Basis of Field Survey

本研究では、小檜山・他(1999)の提案する衛星が捉える夜間可視画像を用いた早期被災地推定手法の検証を行った.検証は, 小檜山・他が行ったトルコ・マルマラ地震(1999)の被災地の推定結果と, 筆者らがトルコで行った現地調査の結果を照合する形で行った.その結果, 小檜山・他の推定手法が, 7.2km×7.2kmメッシュ単位以上での被災地判定に適していること, また, 重度の建物被害だけでなく, より軽度の被害も含めた被害を捕捉していることが明らかになった.In this paper, we verify the method to estimate impacted area using night-time imagery data captured by sattelite proposed by Kohiyama et al.( 1999). Kohiyama et al. estimated the possible impacted area of 1999 Marmara earthquake disaster in Turkey based on their method. We conducted a field survey in the impacted area in Turkey to verify their estimation. As a result, it was clarified that the estimation is effective to detect impacted area in 7.2km X 7.2km unit, and that their estimation can detect various kinds of damages rather than only severe housing damages.本研究では、小檜山・他(1999)の提案する衛星が捉える夜間可視画像を用いた早期被災地推定手法の検証を行った.検証は,小檜山・他が行ったトルコ・マルマラ地震(1999)の被災地の推定結果と,筆者らがトルコで行った現地調査の結果を照合する形で行った.その結果,小檜山・他の推定手法が,7.2km×7.2kmメッシュ単位以上での被災地判定に適していること,また,重度の建物被害だけでなく,より軽度の被害も含めた被害を捕捉していることが明らかになった.In this paper, we verify the method to estimate impacted area using night-time imagery data captured by sattelite proposed by Kohiyama et al.( 1999). Kohiyama et al. estimated the possible impacted area of 1999 Marmara earthquake disaster in Turkey based on their method. We conducted a field survey in the impacted area in Turkey to verify their estimation. As a result, it was clarified that the estimation is effective to detect impacted area in 7.2km X 7.2km unit, and that their estimation can detect various kinds of damages rather than only severe housing damages

Strain Induced in Cracked Utility Poles and Damage to Dwellings from the Dec 26, 2003, Bam Earthquake

The Bam earthquake of December 26, 2003 (Mw6.5) occurred around the city of Bam in southeast Iran. Because the earthquake happened early in the morning at 01: 56: 56 (GMT, 05: 26: 26 local time), most of the reported 43,100 victims were killed in their dwellings. In Iran, there are dense strong ground motion networks for describing the seismological features of earthquakes, but very sparse networks for damage distribution analysis. Actually, damage differed from street block to street block, and only one seismometer was available in the city. Measuring traces of intense shakes remaining in structures, which are seen everywhere and have common features, can be very effective. The authors used utility poles in Bam for this structure. This report provides a spatial distribution of strains induced in these poles, and compares them with damage distribution in the city