Outline of Session

   

Solid Earth Sciences(S) / Seismology(SS)
S-SS35 Recent developments in microtremor surveys

Short title Microtremor survey
Oral presentation
Date/Room/Chair 		May 2 PM1 (14:15 - 16:00) 502 Hisashi Nakahara  / Hiroaki Sato 
May 2 PM2 (16:15 - 17:00) 502 Hiroaki Sato  / Hisashi Nakahara 
Poster presentation
Date/Room 		May 2 (Core Time 16:15 - 17:30) Poster
Contact Hisashi Nakahara
Email naka@zisin.gp.tohoku.ac.jp
Convener Hisashi Nakahara  / Hiroaki Sato 
Scope Microseisms and microtremors (hereafter called microtremors) are considered to be caused by ocean swells and human activities, respectively. Though they are recognized as noise to seismic observations, they can be turned into useful signal in other point of view. The nature of microtremors has been long studied. And the utilization of microtremors for engineering applications have been actively made in Japan such as the classification of site conditions based on the predominant periods, and the estimation of subsurface velocity structures by means of the spatial auto-correlation (SPAC) method and the horizontal-to-vertical (H/V) spectral ratio. These methods are now widely used all over the world in order to estimate shallow subsurface structures in terms of the prediction of strong ground motions. And in the last decade, studies on microtremors have been revitalized, mainly because seismic interferometry was developed and seismic observations became more efficient. For example, the H/V method was reinterpreted based on the theory of diffuse waves. And the centerless circular array (CCA) method was newly developed. Moreover, temporal changes in shallow subsurface structures caused by the nonlinear site effect can be detected by analyzing long-term continuous records of microtremors. In this session, we widely invite contributions on the nature of microtremors and their applications to exploration in order to understand the present status and discuss future directions of the subjects.
Notes  


Time Presentation No Title Author Presenter Abstract
Oral Presentation   May 2 PM1 (14:15-16:00) 502                              to the top
14:15 - 14:35 Invited
SSS35-01 		On the generalization of the SPAC method and the development of a CCA method CHO, Ikuo CHO, Ikuo English
14:35 - 14:50 SSS35-02 Detection of Rayleigh wave and Love wave detection from microtremor array measurements OHORI, Michihiro
CITAK, Seckin
KUBO, Atsuki
other 		OHORI, Michihiro English
14:50 - 15:05 SSS35-03 Estimating composition of ambient noise from three-component records at Tono array TAKAGI, Ryota
NAKAHARA, Hisashi
KONO, Toshio
other 		TAKAGI, Ryota English
15:05 - 15:20 3-min talk in an oral session (SSS35-P01 / SSS35-P02 / SSS35-P04 /SSS35-P05 / SSS35-P06)
15:20 - 15:35 SSS35-04 Toward Earthquake Ground Motion Prediction using the Onshore-Offshore Ambient Seismic Field in Subduction Zones VIENS, Loic
MIYAKE, Hiroe
KOKETSU, Kazuki 		VIENS, Loic English
15:35 - 15:38 3-min talk in an oral session (SSS35-P07)
15:38 - 15:57 Invited
SSS35-05 		Review of study on microtremors and application for subsurface structure modeling SUZUKI, Haruhiko SUZUKI, Haruhiko English
15:57 - 16:00 3-min talk in an oral session (SSS35-P11)
Oral Presentation   May 2 PM2 (16:15-17:00) 502                              to the top
16:15 - 16:30 SSS35-06 Geological Interpretation of a Liquefied Area by 'i-Bido': A Case Study in Urayasu City, Japan (2) SATO, Shinji
HIGASHI, Masashi
HIGUCHI, Shigeo
other 		SATO, Shinji English
16:30 - 16:45 SSS35-07 H/V Spectral Ratios for Both Microtremors and Earthquake Motions and Interpretation based the Diffuse Field Theory KAWASE, Hiroshi
MATSUSHIMA, Shinichi 		KAWASE, Hiroshi English
16:45 - 17:00 SSS35-08 The Effect of the Basin Edge to the Directional Dependent Horizontal-to-Vertical Spectral Ratios of Microtremors MATSUSHIMA, Shinichi
DE MARTIN, Florent
KAWASE, Hiroshi
other 		MATSUSHIMA, Shinichi English


Presentation No Title Author Presenter Abstract
Poster Presentation   May 2  Core Time (16:15-17:30) Poster                    to the top
SSS35-P01 Sophistication of microtremor methods to survey shallow structures, PartI: Development of automatic reading algorithms CHO, Ikuo
SENNA, Shigeki
FUJIWARA, Hiroyuki 		CHO, Ikuo English
SSS35-P02 Sophistication of microtremor methods to survey shallow structures, Part2 : Application of automatic reading algorithms SENNA, Shigeki
CHO, Ikuo
FUJIWARA, Hiroyuki 		SENNA, Shigeki English
SSS35-P03 Future Initiatives of development of microtremor survey observation system SENNA, Shigeki
FUJIWARA, Hiroyuki 		SENNA, Shigeki English
SSS35-P04 Estimation of phase velocity of Rayleigh wave using linear array ZHANG, Xinrui
MORIKAWA, Hitoshi 		ZHANG, Xinrui English
SSS35-P05 Estimation of Subsurface Structure using Microtremor Observation in Ogasawara Iwo-To Island MURAKOSHI, Takumi
KOMORI, Etsuro
SHIMADA, Masaki 		MURAKOSHI, Takumi English
SSS35-P06 Determination of Subsurface Structure of the Mt. Daisen area in Tottori Prefecture by Microtremor and Gravity Survey NOGUCHI, Tatsuya
KAGAWA, Takao
YASUNAGA, Harunobu
other 		NOGUCHI, Tatsuya English
SSS35-P07 Estimation of inter-station Green's functions using microtremor array data HAYASHIDA, Takumi
YOSHIMI, Masayuki 		HAYASHIDA, Takumi English
SSS35-P08 Seismic basement structure estimated from seismic interferometry and microtremor analysis KOIZUMI, Ryo
SAWADA, Akihiro
HIRAMATSU, Yoshihiro
other 		HIRAMATSU, Yoshihiro English
SSS35-P09 Retrieval of Green's function in a 3D inhomogeneous medium with nonisotropic source distribution using interferometry CHIMOTO, Kosuke
YAMANAKA, Hiroaki 		CHIMOTO, Kosuke English
SSS35-P10 Estimation of subsurface structure by high density microtremor observations in Kochi Plain OISHI, Yusuke
KUBO, Atsuki
TAKAHASHI, Hirokazu
other 		OISHI, Yusuke English
SSS35-P11 Recent Geological Interpretation of A Liquefied Area: A Case Study in Urayasu City, Japan (1) IWAMOTO, Hiroshi
HIGASHI, Masashi
HIGUCHI, Shigeo
other 		IWAMOTO, Hiroshi English