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Response of a tall building far from the epicenter of the 11 March 2011 M 9.0 Great East Japan earthquake and aftershocks
Author(s) -
Çelebi Mehmet,
Okawa Izuru,
Kashima Toshidate,
Koyama Shin,
Iiba Masanori
Publication year - 2012
Publication title -
the structural design of tall and special buildings
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.895
H-Index - 43
eISSN - 1541-7808
pISSN - 1541-7794
DOI - 10.1002/tal.1047
Subject(s) - epicenter , aftershock , seismology , low rise , geology , magnitude (astronomy) , duration (music) , geography , physics , archaeology , acoustics , astronomy
SUMMARY The 11 March 2011 M 9.0 Great East Japan earthquake generated significant long‐duration shaking that propagated hundreds of kilometers from the epicenter and affected urban areas throughout much of Honshu. Recorded responses of a tall building at 770 km from the epicenter of the mainshock and other related or unrelated events show how structures sensitive to long‐period motions can be affected by distant sources. Even when the largest peak input motions to the building is about 3% g , the strong‐shaking duration was about 140 s. The 300‐ to 1000‐s prolonged responses of the building are primarily due to a combination of site resonance (e.g. structural fundamental frequency ~0.15 Hz and site frequency ~0.13–0.17 Hz) and low damping (~1–2%) of the structure. Response modification technologies can improve the response of the building during future earthquakes. The need‐to‐consider risks to such built environments from distant sources are emphasized. Copyright © 2012 John Wiley & Sons, Ltd.