scholarly journals Correction: Kim, H.; et al. Geospatial Assessment of the Post-Earthquake Hazard of the 2017 Pohang Earthquake Considering Seismic Site Effects. ISPRS Int. J. Geo-Inf. 2018, 7, 375

2019 ◽  
Vol 8 (2) ◽  
pp. 62
Author(s):  
Han-Saem Kim ◽  
Chang-Guk Sun ◽  
Hyung-Ik Cho
Keyword(s):  
Site Effects ◽  
Earthquake Hazard ◽  
Seismic Site Effects

We have recently been made aware of errata and omissions in the introduction section for describing the seismological characteristics of the 2017 Pohang earthquake as stated in the title of this article, which was recently published in ISPRS [...]

scholarly journals Geospatial Assessment of the Post-Earthquake Hazard of the 2017 Pohang Earthquake Considering Seismic Site Effects

2018 ◽  
Vol 7 (9) ◽  
pp. 375 ◽  
Author(s):  
Han-Saem Kim ◽  
Chang-Guk Sun ◽  
Hyung-Ik Cho
Keyword(s):  
Site Effects ◽  
Focal Depth ◽  
Earthquake Hazard ◽  
Earthquake Damage ◽  
Site Classification ◽  
Topographical Effects ◽  
Seismic Site Effects ◽  
Moderate Earthquake ◽  
Seismic Amplification ◽  
Earthquake Moment

The 2017 Pohang earthquake (moment magnitude scale: 5.4) was South Korea’s second strongest earthquake in decades, and caused the maximum amount of damage in terms of infrastructure and human injuries. As the epicenters were located in regions with Quaternary sediments, which involve distributions of thick fill and alluvial geo-layers, the induced damages were more severe owing to seismic amplification and liquefaction. Thus, to identify the influence of site-specific seismic effects, a post-earthquake survey framework for rapid earthquake damage estimation, correlated with seismic site effects, was proposed and applied in the region of the Pohang earthquake epicenter. Seismic zones were determined on the basis of ground motion by classifying sites using the multivariate site classification system. Low-rise structures with slight and moderate earthquake damage were noted to be concentrated in softer sites owing to the low focal depth of the site, topographical effects, and high frequency range of the mainshocks.

Local Seismic site effects estimated by detailed seismic surveys: the case of Castelnuovo village (L’Aquila Basin, central Italy)

2021 ◽  
Author(s):  
Marco Spadi ◽  
Marco Tallini ◽  
Matteo Albano ◽  
Domenico Cosentino ◽  
Marco Nocentini ◽  
...  
Keyword(s):  
Cross Sections ◽  
Site Effects ◽  
Dynamic Properties ◽  
Central Italy ◽  
Earthquake Hazard ◽  
Small Scale ◽  
Seismic Site Effects ◽  
New Findings ◽  
Subsoil Model ◽  
Observed Damage

<p>Assessing seismic site effects is essential in earthquake hazard studies. Local seismic amplification is strongly related to the site stratigraphy and topography, the dynamic properties of the subsoil deposits, and the earthquake features. The evaluation of these factors is mandatory to achieve a consistent model of the seismic hazard at small scale. Here we discuss the case of Castelnuovo village (L’Aquila, central Italy). Located on a small ridge, approximately 60 m higher than the valley floor, the village was heavily struck by April 6, 2009, M<sub>w</sub> 6.3 L’Aquila earthquake, with catastrophic collapse of several buildings. Previous studies ascribed the observed damage to the presence of shallow caves beneath the buildings or to the topographic amplification.</p><p>In this work, an updated and detailed subsoil model for Castelnuovo site has been provided, based updated geological surveys, such as borehole logs and geophysical data consisting in microtremor measurements and down-hole.</p><p>These measurements identified resonant frequencies occurring in the range of 0.7-3.0 Hz. These frequency peaks are related to the presence of a velocity contrast at depth between the San Nicandro silts and the Madonna della Neve breccias, as indicated by the performed deep boreholes. Thanks to analytical, numerical, and geostatistical techniques, we identified the main impedance contrast at approximately 210 m depth from the top of the hill, much deeper than previous studies. These new findings allowed to create an accurate and consistent subsoil model summarized by two geological cross-sections of the Castelnuovo ridge, showing that the seismic site effects at the Castelnuovo village are mainly related to stratigraphic amplification.</p>

scholarly journals Seismic site effects in the Red Zone of Amatrice hill detected via the mutual sustainment of experimental and computational approaches

2020 ◽  
Vol 18 (5) ◽  
pp. 1955-1984
Author(s):  
Gerardo Grelle ◽  
Elisa Gargini ◽  
Johann Facciorusso ◽  
Rosalba Maresca ◽  
Claudia Madiai
Keyword(s):  
Site Effects ◽  
Computational Approaches ◽  
Seismic Site Effects

scholarly journals Geo-Proxy-Based Site Classification for Regional Zonation of Seismic Site Effects in South Korea

2018 ◽  
Vol 8 (2) ◽  
pp. 314 ◽  
Author(s):  
Chang-Guk Sun ◽  
Han-Saem Kim ◽  
Hyung-Ik Cho
Keyword(s):  
South Korea ◽  
Site Effects ◽  
Site Classification ◽  
Seismic Site Effects

Numerical modeling of seismic site effects in a shallow estuarine bay (Suai Bay, Shantou, China)

2019 ◽  
Vol 260 ◽  
pp. 105233 ◽  
Author(s):  
Bin Ruan ◽  
Kai Zhao ◽  
Su-Yang Wang ◽  
Guo-Xing Chen ◽  
Hai-Yun Wang
Keyword(s):  
Numerical Modeling ◽  
Site Effects ◽  
Seismic Site Effects

Student Zone

2021 ◽  
Vol 40 (5) ◽  
pp. 386-387
Author(s):  
Ravi Pangeni
Keyword(s):  
Earthquake Engineering ◽  
Site Effects ◽  
Geotechnical Earthquake Engineering ◽  
Site Characteristics ◽  
Seismic Site Effects ◽  
Hands On ◽  
Basin Geometry ◽  
Student Training ◽  
Microtremor Measurements ◽  
Effects Assessment

A student training program, Engineering Seismology and Seismic Microzonation for Seismic Site Effects Assessment, was held 18–22 January 2020 in Lalitpur, Nepal. It was created through the collaboration of Thammasat University and Tribhuvan University, with support from Geoscientists Without Borders® (GWB). The goal of the program was to connect students with modern geophysical instrumentation and software through training. It specifically advanced theoretical and hands-on field-based knowledge pertaining to geotechnical earthquake engineering aspects and applications. The training served as part of a broader GWB project, Seismic Site Effects Study in Nepal, encompassing basin geometry, site characteristics, and the study of seismic site effects through microtremor measurements in Kathmandu Valley.

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