Hari Jumat 15 January 2010, saya mengikuti seminar khusus

Presentasi dari Takuji Yamada San yang sedang bekerja di USGS Hawaii.

Ada 2 hal yang beliau presentasikan:

1. Relationship of the Main Shock Slip with Hypocenters and Source Parameters of Aftershocks: The 2006 Kiholo Bay, Hawaii, Earthquake Sequence. Abstractnya bisa dibaca di bawah.

2. Aktifitas gunung Kilauea di Hawaii.

Pada saat beliau bekerja disana, ada sebuah vent baru yang terbentuk pada bulan Maret 2008. Beliau menunjukkan foto-foto dan juga beberapa video aktifitas gunung basaltic. Ada 3: 2 vent diatas gunung Kilauea, dan 1 vent di tepi laut. Yang di tepi laut ini, lava yang keluar langsung masuk ke dalam laut, bisa mencapai 30 km.

Saya benar-benar terkesan melihat videonya. Semoga di kemudian mendapat kesempatan mengobservasi secara langsung.

Informasi lebih lanjut bisa dilihat di page USGS-Hawaii

Info gohawaii, bisa langsung lihat video dan foto volcano di Hawaii, juga tourism spot dan beragam info lainnya mengenai hawaii.

Laporan dari page RSVD bisa klik disini

特別セミナー(2010/01/15)


日時:2010年1月15日(金)13:00-14:30
場所:理学部E館411号室
講師:ハワイ火山観測所(米国地質調査所)
学術振興会 特別研究員 山田卓司氏
タイトル:2006年ハワイ島で起きたMw6.7のキホロ湾地震について

Title:
Relationship of the Main Shock Slip with Hypocenters and Source Parameters of Aftershocks: The 2006 Kiholo Bay, Hawaii, Earthquake Sequence
Abstract:
We study the source process of the Kiholo Bay earthquake (Mw 6.7), which occurred beneath the NW part of the Island of Hawaii on October 15, 2006, an static stress drops of small earthquakes that occurred in 2006 and 2007 around the main shock including aftershocks.
Waveform inversion is performed with multiple time windows to investigate the rupture speed and the slip distribution of the main shock. Our results indicate that the rupture propagated unilaterally to the west with a rupture speed greater than 3.0 km/s (63% of the shear wave velocity).
This westward rupture is consistent with the fact that aftershocks are distributed predominantly to the west of the main shock epicenter. Most aftershocks are located on the edge of patches with a large slip, or asperities and some also occur inside the patches.
We also estimate static stress drops of 39 earthquakes (2.5 < M < 3.5) that occurred in 2006 and 2007 near the source region of the Kiholo Bay earthquake. Static stress drops range from 0.12 to 8.6 MPa and aftershocks around large slip patches of the main shock likely to have larger stress drops.