Research Article| September 01, 1996 The Cause of the Damage Belt in Kobe: “The Basin-Edge Effect,” Constructive Interference Direct S-Wave with Basin-Induced Diffracted/Rayleigh Waves Hiroshi Kawase Ohsaki Institute 2-2-2 Uchisaiwai-cho, Chiyoda Tokyo 100, Japan (H.K.) Search for other works by this author on: GSW Google Scholar Author and Article Information Publisher: Seismological Society America First Online: 09 Mar 2017 Online ISSN: 1938-2057 Print 0895-0695 © Letters (1996) 67 (5):...

Abstract The responses of two types soft basins for incident SH, SV, P , and Rayleigh waves in a 2-D elastic half-space are investigated with special reference to the long duration strong motions observed Mexico City during Michoacan, Mexico, earthquake 1985. First, difficulty simple 1-D models reproduce later part accelerogram is shown. Then effect deep basin structure relatively large scale (10 km wide 1 deep) moderate impedance ratio (2.5) studied. results show that surface generated at...

Abstract The responses of a semi-circular canyon for incident SH, SV, P, and Rayleigh waves in two-dimensional elastic half-space are investigated time domain as well frequency domain. author proposes the discrete wavenumber boundary element method, which direct method is used with Green's function. This combination achieves both efficiency computation flexibility configurations. First, validity confirmed by comparing its results published ones Then histories seismic motion along surface...

The Horizontal-to-Vertical spectral ratios of microtremors (MHVR) have been utilized as a convenient tool to extract predominant frequency at target site. so-called "Nakamura" method, which was proposed by Nakamura in 80's, assumed that MHVR provides us directly the S-wave amplification factor earthquake horizontal component, is, Horizontal-to-Horizontal ratio (HHR) with respect bedrock, although validity method had never proved. Recently, based on diffuse field concept (DFC) Sánchez-Sesma...

Type V collagen became solubilized in softened sardine muscle after 1 day of chilled storage with the concomitant weakening pericellular connective tissue induced by disintegration thin fibrils. However, no significant changes were observed structure interstitial or biochemical properties type I collagen. Z disk myofibrils showed structural changes, but loss longitudinal continuity was even at deteriorated from destroyed compression test. On other hand, tiger puffer did not show softening...

Abstract Buildings damaged by the Whittier Narrows, California, earthquake of 1 October 1987 were concentrated in several areas, most which located 8 to 10 km from epicenter (corresponding critical incidence for SV waves) and near topographic irregularities, such as northern part Whittier, just south Puente Hills. The purpose this study is show possibility that anomalous damage pattern due amplification irregularity when waves are near-critical incidence. First we examined accelerograms...

Thrombosis in the left upper pulmonary vein stump after lobectomy is a very rare but important complication because it occurs systemic circulation system. We previously made first ever report on frequency and risk factors of thrombosis lobectomy. In this study, we conducted an investigation different hospital to determine whether was common complication.From 2008 2012, 151 patients who underwent following enhanced CT within 2 years operation were studied. Postoperative contrast-enhanced...

Abstract We propose an optimal way to use horizontal‐to‐vertical spectral ratios (HVRs) for subsurface structure exploration, based on the diffuse field concept (Kawase et al. , 2011; Sanchez‐Sesma 2011). This approach is applicable both earthquake and microtremor ground motions. show here analyses of observed ground‐motion data at around a K‐NET station in Miyagi Prefecture, Japan, where very large peak horizontal acceleration was during 11 March 2011 off Pacific coast Tohoku, Japan....

We examine the energy partitions among elastic waves due to dynamic normal and tangential surface loads in a semi-infinite solid. While results for load on of half-space with Poisson ratio 1/4 is well-known result by Miller Pursey (1955), corresponding are almost unknown. The were computed independently Weaver (1985) versus (0≤ ν ≤1/2), using diffuse-field concepts within context ultrasonic measurements. connection point was not explicit, which partially explains why these did reach...

Abstract The objective of this study is to investigate in detail the characteristics strong ground motions separated from acceleration Fourier spectra observed by K‐NET, KiK‐net, and Japan Meteorological Agency (JMA) Shindokei network using generalized spectral inversion method. separation method used here same as that proposed Kawase Matsuo (2004), with reference bedrock site at YMGH01. We include events magnitude equal or larger than 4.5 1996 2011. Our results are good agreement previous...

We have been discussing the validity of using horizontal-to-vertical spectral ratios (HVRs) as a substitute for S-wave amplifications after Nakamura first proposed idea in 1989. So far formula HVRs had not derived that fully utilized their physical characteristics until recent proposal based on diffuse field concept. There is another source confusion comes from mixed use earthquake and microtremors, although wave fields are hardly same. In this study, we compared observed microtremors (MHVR)...

This article describes an open-source site database for a total number of 1742 earthquake recording sites in the K-NET (Kyoshin network) and KiK-net (Kiban Kyoshin networks Japan. contains characterization parameters directly derived from available velocity profiles, including average wave velocities, bedrock depths, contrast. Meanwhile, it also consists horizontal-to-vertical spectral ratio (HVSR) peak parameters, example, frequency, amplitude, width, prominence. In addition, comprises...

Earthquake site responses or effects are the modifications of surface geology to seismic waves. How well can we predict (average over many earthquakes) at individual sites so far? To address this question, tested and compared effectiveness different estimation techniques in predicting outcrop Fourier separated using general inversion technique (GIT) from recordings. Techniques being evaluated (a) empirical correction horizontal-to-vertical spectral ratio earthquakes (c-HVSR), (b)...

ABSTRACT Generalized inversion techniques (GITs) have become popular for determining seismological parameters (e.g., source, attenuation, and site response), particularly in low-to-moderate seismicity regions. Indeed, GITs can potentially provide reliable site-response estimates when a minimum number of recordings is available, as well valuable information about source regional attenuation characteristics. Significant advances been made on which different approaches hypotheses were...

Abstract This technical report explains details on the results of investigation to build a subsurface structural model and selection earthquake data at target site blind prediction exercise for “The 6th International Association Seismology Physics Earth’s Interior/International Earthquake Engineering Symposium Effect Surface Geology Seismic Motion (ESG6).” The process in Kumamoto Plain, Japan, ESG6 was explained with historical review tests previous ESG conferences. We have collected...

Abstract Horizontal-to-vertical spectral ratios of microtremors (MHVRs) have been interpreted as representing either the Rayleigh-wave ellipticity or amplitude ratio sum Rayleigh and Love waves in a horizontally layered structure. However, based on recently established diffuse field concept, theoretical form MHVR has proposed to be square root between imaginary part horizontal Green’s function surface that vertical one. The theory assumes energy wavefield inside earth will equipartitioned...

ABSTRACT The main purpose of the site classification or velocity determination at a target is to obtain estimate horizontal amplification factor (HSAF) that during future earthquakes because HSAF would have significant effects on strong-motion characteristics. We been investigating various kinds methods delineate S-wave structures and subsequent HSAF, as precisely possible. After advent diffuse field concept, we derived simple formula based equipartitioned energy density observed in layered...

In site-specific site-response assessments, observation-based approaches requiring a target–reference recording pair or regional network cannot be implemented at many sites of interest. Thus, various estimation techniques have to used. How effective are these in predicting site responses (average over earthquakes)? To address this question, we conduct systematic comparison using large data set which consists detailed metadata and Fourier outcrop linear based on observations 1725 K-NET...

Abstract We present results from a borehole observation network composed of 12 sites deployed in 20 × km area the Sendai region, Japan. The subsurface Quaternary layers vary with each site, but Pliocene layer is commonly underlying at depth 0 to 80 m throughout region. define this layer, whose S-wave velocity larger than 500 m/sec and N value standard penetration test greater 50, as an engineering bedrock Once we characterize ground motions bedrock, can either use these directly response...

As observational evidence of 3-D microtremor horizontal-to-vertical spectral ratios (MHVRs), previous studies have shown that a significant directional dependency is observed in and around Uji campus, Kyoto University, Japan. This dependence considered to be the result 2-D basin structure. In this study, we microtremors strong motion observation site Port Harbor Research Institute Onahama, Japan, found MHVRs exists some parts area site. The more apparent has higher dominant frequency, at 5...

SUMMARY In this paper, we explore the use of seismicity data on a single-station basis in site response characterization. We train supervised deep-learning model, SeismAmp, to recognize and separate seismic with reference seismological bedrock (VS = 3.45 km s−1) broad frequency range (0.2–20 Hz) directly from earthquake recordings (features) Japan. Ground-truth are homogeneously created using classical multistation approach—generalized spectral inversion at total number 1725 sites....