scholarly journals LOCAL GEOLOGY AND SITE CLASS ASSESSMENT BASED ON MICROTREMOR DATA IN NORTH LOMBOK

2021 ◽  
Vol 4 (2) ◽  
pp. 67
Author(s):  
Suhayat Minardi ◽  
Nirmala Aprianti ◽  
Akhmad Solikhin
Keyword(s):  
Seismic Vulnerability ◽  
Site Effect ◽  
Vulnerability Index ◽  
Dominant Frequency ◽  
Sediment Layer ◽  
Local Site Effect ◽  
Site Class ◽  
The North ◽  
Local Site ◽  
Dominant Period

Lombok Island is an active seismic area in Indonesia potentially hit by an earthquake due to located between two earthquake generators from the south and the North. Several large earthquakes rocked Lombok, an earthquake with a magnitude of 6.4 on July 29, 2018, and 7.0 on August 5, 2018. This study aims to determine the characteristics of the local site effect based on the dominant frequency value ( ), soil amplification ( ), sediment layer thickness (d), , dominant period (T0), and seismic vulnerability index ( ) and to comprehend the soil class (site class) based on the thickness of the sediment layer (d), and  in the North Lombok region. The data used is secondary data from microtremor signal recordings in North Lombok Regency in 2018. Data processing used Geopsy software, and microtremor data were analyzed using the HVSR method. From processing the HVSR data, the dominant frequency value about (0.8 - 18) Hz, amplification value (1.7 – 9.7), dominant period value (0.05 – 1.2) seconds, seismic vulnerability index value (0.4 – 71) , and the value of   in the study area (20.05 – 287.04) m/s. Based on microtremor analysis, the local site effect indicates that alluvium rocks caused stronger earthquake vibrations and more damage. Whereas the Kalibabak and Lekopiko formations caused fewer earthquake vibrations and less wear. Based on the dominant period and , area study classify as Site Class IV class E and Site Class III class D  Copyright © 2021 IPR. All rights reserved.

scholarly journals Determination of earthquake prone zones at university of tadulako based on dominant periods and peak ground acceleration (PGA)

2022 ◽  
Vol 1212 (1) ◽  
pp. 012037
Author(s):  
I U Meidji ◽  
S Mulyati ◽  
N R Janat ◽  
H Jayadi ◽  
Asrafil
Keyword(s):  
Peak Ground Acceleration ◽  
Site Effect ◽  
Sediment Layer ◽  
Building Structures ◽  
State University ◽  
Local Site Effect ◽  
Ground Acceleration ◽  
Damage Level ◽  
Local Site ◽  
Hvsr Method

Abstract University of Tadulako is the largest State University in Palu City. When an earthquake with a magnitude of 7.4 Mw on September 28, 2018, occurred, many buildings were damaged and even collapsed at that time, even causing casualties due to the rubble. Research on the Local Site Effect is essential for the assessment of seismic hazard. In this study, the local site effect was analyzed using the HVSR method based on microtremor data. The predominant Period (To) ranges between 1.709 s to 3.816 s, indicates that this area consists of alluvium and has a very thick sediment layer. Another parameter calculated in this paper is the peak ground acceleration (PGA) with values from 0.914 g to 0.924 g. This value is the first indicated soil damage level due to ground motions. The results of this study can be used as a consideration in the development of regional spatial planning and building structures based on earthquake analysis.

Application Of Surface-Wave Method To The Evaluation Of Local Site Effect Of 2007 Noto Earthquake

2008 ◽  
Author(s):  
Koichi Hayashi ◽  
Masahito Tamura ◽  
Tsutomu Hirade ◽  
Kosh Nath Adhikari ◽  
Yu Shizhou
Keyword(s):  
Surface Wave ◽  
Site Effect ◽  
Wave Method ◽  
Local Site Effect ◽  
Local Site ◽  
Surface Wave Method

Comparison of different local site effect estimation methods in site with high thickness of alluvial layer deposits: a case study of Babol city

2020 ◽  
Vol 13 (7) ◽  
Author(s):  
Asskar Janalizadeh Choobbasti ◽  
Saman Soleimani Kutanaei ◽  
Hamed Taleshi Ahangari ◽  
Meisam Mahmudi Kardarkolai ◽  
Hossein Motaghedi
Keyword(s):  
Site Effect ◽  
Estimation Methods ◽  
Local Site Effect ◽  
Local Site ◽  
Effect Estimation

Contribution of local site-effect on the seismic response of suspension bridges to spatially varying ground motions

2016 ◽  
Vol 10 (5) ◽  
pp. 1233-1251 ◽  
Author(s):  
Suleyman Adanur ◽  
Ahmet C. Altunisik ◽  
Kurtulus Soyluk ◽  
A. Aydin Dumanoglu ◽  
Alemdar Bayraktar
Keyword(s):  
Seismic Response ◽  
Ground Motions ◽  
Site Effect ◽  
Suspension Bridges ◽  
Local Site Effect ◽  
Local Site ◽  
Spatially Varying Ground Motions ◽  
Spatially Varying

scholarly journals ANALISIS KETEBALAN LAPISAN SEDIMEN DAN INDEKS KERENTANAN SEISMIK KOTA JAMBI BAGIAN TIMUR

2020 ◽  
Vol 6 (1) ◽  
pp. 18-30
Author(s):  
Arie Satria ◽  
Ichy Lucya Resta ◽  
Nasri MZ
Keyword(s):  
Layer Thickness ◽  
Natural Frequency ◽  
Seismic Vulnerability ◽  
Amplification Factor ◽  
Vulnerability Index ◽  
Research Area ◽  
Ratio Method ◽  
Sediment Layer ◽  
Alluvial Deposits ◽  
High Zone

A Research was carried about analysis of sediment layer thickness and seismic vulnerability index in eastern Jambi City. The purpose of this research was to  determine the effect of sediment layer thickness on seismic vulnerability index in eastern Jambi City based on microtremor data. The Acquisition data of microtremor is 25 points spread in research area. Processing data was carried out using the HVSR (Horizontal to Vertical Spectra Ratio) method to obtain the H/V curve. This curve represents the value of the natural frequency (f0) and amplification factor (A0). Based on the results of data processing obtained, the range of natural frequency (f0) value is 1.04 – 3.78 Hz, the range of amplification factor (A0) value is 1.13 - 4.88 times, the range of sediment layer thickness (h) value is 16.46 – 61.45 meters, and the range of seismic vulnerability index (Kg) value is 0.70 - 20.18×10-6 cm2/s. The results showed that the distribution of seismic vulnerability index (Kg) correlated relatively well with sediment layer thickness of the research area. The high zone of seismic vulnerability index (Kg) is relatively associated with alluvial deposits and also the sediment layer thickness of more than 30 meters. The high zone of seismic vulnerability index (Kg) is concentrated in Pasir Panjang, Tanjung Raden to Olak Kemang in Danau Teluk sub-district and Tanjung Sari in Jambi Timur sub-district.

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