scholarly journals Intepretasi Lapisan Sedimen berdasarkan Ground Profile Vs dengan Pengukuran Mikrotremor di Kecamatan Pacitan

2018 ◽  
Vol 8 (1) ◽  
pp. 32
Author(s):  
Nugroho Budi Wibowo ◽  
Juwita Nur Sembri ◽  
Deny Darmawan ◽  
Yosafat Sumardi ◽  
Fitria Afriliani ◽  
...  
Keyword(s):  
Site Effect ◽  
Local Site Effect ◽  
Local Site ◽  
Ground Profile

<p>Ketebalan lapisan sedimen pada suatu wilayah dapat menyebabkan local site effect ketika terjadi gempabumi. Hal ini dikarenakan ketebalan lapisan sedimen berpengaruh terhadap amplifikasi. Kota Pacitan berdasarkan formasi geologi berada pada Formasi Aluvium (<em>Qa</em>) yang didominiasi lapisan sedimen. Penelitian ini bertujuan mengintepretasi ketebalan lapisa sedimen di Kecamatan Pacitan berdasarkan model ground profile <em>Vs </em>hasil akuisisi mikrotremor. Akuisisi dilakukan pada 25 titik di Kecamatan Pacitan menggunakan <em>seimograph portable </em>TDS. Ground profile <em>Vs</em> hasil pemodelan <em>elipticity curve</em>  menunjukkan bahwa nilai <em>Vs</em> bervariasi dari 153.11 m/s  (Formasi Aluvium) sampai 1393.48 m/s (Formasi Batuan Terobosan Andesit). Model ground profile <em>Vs</em> lapisan kedua yang berkorelasi dengan lapisan sedimen berada pada nilai <em>Vs</em>&lt; 750 m/s dengan area di Dataran Aluvial Sungai Grindulu dan Teluk Pacitan. Ketebalan lapisan sedimen hasil analisa ground profile <em>Vs</em>, bervariasi dari 2.59 – 94.37 m. Lapisan sedimen paling tebal terdapat pada Formasi Aluvium (<em>Qa</em>) dengan ketebalan 94.37 m, dan lapisan sedimen paling tipis terdapat pada Formasi Jaten (Tmj) setebal 2.59 m. Lapisan sedimen dengan ketebalan lebih dari 50 m berada di kawasan Kota Pacitan, Teluk Pacitan dan Sungai Grindulu.</p>

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 Seismic hazard assessment and local site effect evaluation in Hanoi, Vietnam

2017 ◽  
Vol 17 (4B) ◽  
pp. 82-95
Author(s):  
Nguyen Anh Duong ◽  
Pham Dinh Nguyen ◽  
Vu Minh Tuan ◽  
Bui Van Duan ◽  
Nguyen Thuy Linh
Keyword(s):  
Seismic Hazard ◽  
Shear Wave ◽  
Ground Motion ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Peak Ground Acceleration ◽  
Site Effect ◽  
Local Site Effect ◽  
Ground Acceleration ◽  
Local Site

In this study, we have carried out the probabilistic seismic hazard analysis in Hanoi based on the latest seismotectonic data. The seismic hazard map shows peak ground acceleration values on rock corresponding to the 10% probability of exceedance in a 50-year time period (approximately return periods of 500 years). The calculated results reveal that the maximum ground acceleration can occur on rock in Hanoi is about 0.13 g corresponding to the shaking intensity level of VIII on the MSK-64 scale. The ground motion values calculated on rock vary according to the local site conditions. We have evaluated and corrected the local site effects on ground motion in Ha Dong district, Hanoi by using microtremor and borehole data. The Nakamura’s H/V spectral ratio method has been applied to establish a map of ground dominant periods in Ha Dong with a TS range of 0.6 - 1.2 seconds. The relatively high values of periods indicate that Ha Dong has soft soil and thick Quaternary sediments. The sediment thickness in Ha Dong is calculated to vary between 30 - 75 m based on ground dominant periods and shear wave velocity VS30 = 171 - 254 m/s. The results of local site effect on ground motion show that the 500-year return period peak ground acceleration in Ha Dong ranges from 0.13 g to 0.17 g. It is once again asserted that the seismic hazard in Hanoi is a matter of great concern, due not only to the relatively high ground acceleration, but also to the seismic characteristics of soil (low shear wave velocity, ground dominant period of approximately 1 second).

Sign in / Sign up

Export Citation Format

Share Document