학술논문
Analysis of Seismogram of the 1923 Kanto Earthquake at Tokyo by Ewing Disk-Recording Strong-Motion Seismograph Part 1 Reinterpretation of the Seismogram Traced by Nasu / ユーイング円盤記録式強震計による1923年関東地震の記象の解析 その1 那須による原記象のトレース図の再解釈
Document Type
Journal Article
Author
Source
日本地震工学会論文集 / Journal of Japan Association for Earthquake Engineering. 2021, 21(4):4-49
Subject
Language
Japanese
ISSN
1884-6246
Abstract
The strong ground motion of the 1923 Kanto earthquake was recorded at Hongo, Tokyo by a Ewing disk-recording strong-motion seismograph. The seismograph consists of SW-NE, SE-NW and U-D components, and the original seismogram was traced on a tracing paper by Nasu (1957). The traced seismogram shows four sets of the traces which are lines of discontinuity due to scale-out of the indicator of the seismograph. Considering the different arm length curvatures in traces of the three components, the three component traces are distinguished from four sets of the traces. Although the distinguished traces have blank parts due to the scale-out of the indicator from the disk, the peak amplitudes of the SW-NE and SE-NW components are estimated to be about 20 cm and 40 cm, respectively.