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Abstract <p>Data from the June 14, 2008 Iwate–Miyagi Nairiku thrust earthquake (<i>Mw</i> ~6.9, source depth <i>h</i> ~ 8 km) recorded by vertical seismic arrays IWTH25, IWTH26, and AKTH04 are analyzed. These near-source stations recorded anomalous peak ground accelerations exceeding 1g. The IWTH25 station, closest to the source, detected the highest ever recorded peak acceleration of ~4g in the vertical component, with a maximum vector sum over three components of ~4278 cm/s<sup>2</sup> (4.36g). To account for the characteristic features of the Iwate–Miyagi Nairiku earthquake, soil behavior models were constructed that track vertical stress and strain distributions in soil layers, varying with time during strong motion. These models capture the generation of anomalously high accelerations in the vertical (up to ~4g) and horizontal (up to ~2.5g) components in the source zone and the asymmetry of the accelerograms in the vertical components. The effects observed in the fault zones of earthquakes, including high vertical accelerations, are important factors determining strong motion parameters. They drive significant variations in shaking intensity in the vicinity of the source even under identical soil conditions and epicentral distances.</p>

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Generation of Anomalous High Accelerations (PGA ~ 4g) in the June 14, 2008 Iwate–Miyagi Nairiku, Japan Thrust Event (Mw ~ 6.9, h ~ 8 km)

  • 期刊论文

  • 发表日期：

    2026年2月1日

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  • O. V. Pavlenko

摘要

Abstract

Data from the June 14, 2008 Iwate–Miyagi Nairiku thrust earthquake (Mw ~6.9, source depth h ~ 8 km) recorded by vertical seismic arrays IWTH25, IWTH26, and AKTH04 are analyzed. These near-source stations recorded anomalous peak ground accelerations exceeding 1g. The IWTH25 station, closest to the source, detected the highest ever recorded peak acceleration of ~4g in the vertical component, with a maximum vector sum over three components of ~4278 cm/s2 (4.36g). To account for the characteristic features of the Iwate–Miyagi Nairiku earthquake, soil behavior models were constructed that track vertical stress and strain distributions in soil layers, varying with time during strong motion. These models capture the generation of anomalously high accelerations in the vertical (up to ~4g) and horizontal (up to ~2.5g) components in the source zone and the asymmetry of the accelerograms in the vertical components. The effects observed in the fault zones of earthquakes, including high vertical accelerations, are important factors determining strong motion parameters. They drive significant variations in shaking intensity in the vicinity of the source even under identical soil conditions and epicentral distances.