In the early morning (01:47 local time) of September 21, 1999, largest earthquake century in Taiwan (Mw=7.6, ML=7.3) struck central island near small town Chi‐Chi. The hypocenter was located by Central Weather Bureau Seismological Center at 23.87°N, 120.75°E, with a depth about 7 km. There were extensive surface ruptures for 85 km along Chelungpu fault vertical thrust and left lateral strike‐slip offsets. maximum displacement 9.8 meters is among movements ever measured modern earthquakes....

Subduction zone earthquakes have not been taken into special consid- eration in most previous probabilistic seismic hazard analyses (PSHA) Taiwan. However, they may be critical to properly analyze the earthquake metro- politan Taipei, so need studied. Strong-motion data from subduction earthquakes, of both interface and intraslab types, obtained by TSMIP SMART1 arrays northeastern Taiwan, are used establish attenuation equa- tions for peak ground acceleration (PGA) response spectral (SA)....

In this study, we quantify the reduction in standard deviation for empirical ground-motion prediction models by removing ergodic assumption. We par- tition modeling error (residual) into five components, three of which represent repeatable source-location-specific, site-specific, and path-specific deviations from population mean. A variance estimation procedure these components is developed use with a set recordings earthquakes not heavily clustered space. With most source locations...

Research Article| October 01, 2001 Site Classification of Taiwan Free-Field Strong-Motion Stations Chyi-Tyi Lee; Lee Search for other works by this author on: GSW Google Scholar Chin-Tung Cheng; Cheng Chi-Wen Liao; Liao Yi-Ben Tsai Author and Article Information Publisher: Seismological Society America First Online: 03 Mar 2017 Online ISSN: 1943-3573 Print 0037-1106 Copyright © the Bulletin (2001) 91 (5): 1283–1297. https://doi.org/10.1785/0120000736 history Cite View This Citation Add to...

The 1999 Chi-Chi earthquake was caused by rupture of the Chelungpu fault, one most prominent active thrust faults Taiwan. This largest Taiwan's historical fault ruptures broke surface for over 90 km at western base rugged mountain range. A short right-lateral tear extended southwestward from southern end and a complex assemblage shallow folds ran northeastward northern end. Vertical offsets averaged about 2 m along half 4 half, 5 to 7 were typical part major thrust. sinuous nature trace is...

Abstract. For the interpretation of storm event-induced landslide distribution for an area, deterministic methods are frequently used, while a region's susceptibility is commonly predicted via statistical approach based upon multi-temporal inventories and environmental factors. In this study we try to use event-based inventory, set variables triggering factor build model region which solved using multivariate method. Data shallow landslides triggered by 2002 typhoon, Toraji, in central...

Probabilistic seismic hazard maps are widely used for engineering design, land use planning, and disaster mitigation etc. This study conducted a review of readily available information on tectonic setting, geology, seismicity, the attenuation peak ground acceleration (PGA) Taiwan completing revised probabilistic by state-of-the-art analysis (PSHA) method. The mainshocks from earthquake catalog 1900 to 1999 were evaluate recurrence rate regional sources subduction - intraslab...

The average shear-wave velocity of the upper 30 meters a soil profile (Vs30) is key indicator site response dominating ground-motion amplification.The primary purpose this study to map distribution Vs30 in Taiwan using available data and multivariate geostatistical techniques.Data from 230 boring PS logging at soft rock strong-motion station sites were used establish spatial relationship between (Vs) N value standard penetration test (SPT-N).The resultant model was then estimate each depth...

Abstract This study proposes a sediment‐budget model to predict the temporal variation of debris volume stored in debris‐flow prone watershed. The is dominated by shallow landslides and outflow. basin topography source area watershed help evaluating its susceptibility. susceptibility applied Tungshih central western Taiwan. importance predicting reflected standardized coefficients proposed statistical discriminant model. high prediction rate (0·874) for occurrence flows justifies capability...

Abstract. To investigate the physico-chemical properties of aerosols in Taiwan, an observation network was initiated 2003. In this work, measurements mass concentration and carbonaceous composition PM10 PM2.5 are presented. Analysis on data collected first 5-years, from 2003 to 2007, showed that there a very strong contrast aerosol between rural urban/suburban stations. The five-year means EC at respective stations ranged 0.9±0.04 4.2±0.1 μgC m−3. areas, accounted for 2–3% 3–5% loadings,...

Tsaoling landslide is the largest and best documented among several large landslides induced by 1999 Taiwan Chi-Chi earthquake. Pliocene sedimentary rocks of about 125 Mm3 in volume slid along very flat bedding planes dipping 14° with an average speed 35–40 m/s for 1650 m, before hitting bank Chinshui River during landslide. Detailed analysis DTMs after earthquake using a GIS software leads to accurate determination locations centroids mass, revealing horizontal vertical displacements 2524 m...

Ohmic contacts with low resistance are fabricated on n-type GaN films using Ti/Ag bilayer metallization. The grown by pressure metalorganic chemical vapor deposition (LP-MOCVD) Si as the dopant. characteristics studied for carrier concentration range from 1.5×1017 to 1.7×1019 cm−3. lowest value specific contact resistivity of 6.5×10−5 Ω cm2 is obtained without annealing. barrier height Ti calculated be 0.067 eV.

Pliocene sedimentary rocks of about 130 Mm3 in volume slid along bedding planes dipping by 14°, with an average speed 35 m/s, during the Tsaoling landslide. We conducted friction experiments to reproduce initiation processes this landslide, idealizing landslide movements earthquake as accelerating/decelerating motion. Experiments were done on shale from field, at 3 MPa normal stress corresponding overburden pressure. Results indicate that motion causes weakening and strengthening each...

[1] Typhoon Morakot struck southern Taiwan in the summer of 2009, causing most severe flooding since 1950s. In early morning August 9, rainfall triggered Hsiaolin landslide, and resulting debris avalanche covered township Village, Kaohsiung. Around five hundred people were buried alive. Reconstruction runout would increase understanding large-scale avalanches for future hazard mitigation purposes. Simulation can provide valuable information this purpose. A new continuum shallow-water model...

Structural and paleostress analyses provide new insights into the Quaternary kinematics of outermost fold‐and‐thrust units southwestern Taiwan Foothills. The frontal folds are interpreted as fault‐related folds, their tectonic evolution through space time is tightly constrained. Fold development correlated with reef building on top anticlines. Moreover, we field evidence that NW–SE fault zones oblique to structural grain belt probably acted transfer during fold‐thrust emplacement. Two...

Abstract. Rainfall-induced landslides number among the most devastating natural hazards in world and early warning models are urgently needed to reduce losses fatalities. Most landslide systems based on rainfall thresholds defined regional scale, regardless of different susceptibilities various slopes. Here we divided slope units southern Taiwan into three categories (high, moderate low) according their susceptibility. For each category, established separate so as provide differentiated for...