ANALYSIS OF MICROZONATION SEISMIC VULNERABILITY INDEX AROUND REPAKING VILLAGE, BOYOLALI, CENTRAL JAVA USING HVSR METHOD

2018 ◽  
Author(s):  
S.A. Widita ◽  
M. Kurniado ◽  
M.A. Girash ◽  
T.M. Irnaka
Keyword(s):  
Seismic Vulnerability ◽  
Vulnerability Index ◽  
Central Java ◽  
Hvsr Method

scholarly journals Ambient Noise Analysis During Nyepi in Denpasar Using Horizontal-to-Vertical Spectral Ratio (HVSR) Method

2020 ◽  
Vol 18 (1) ◽  
pp. 23
Author(s):  
I Putu Dedy Pratama ◽  
Dwi Karyadi Priyanto ◽  
Pande Komang Gede Arta Negara
Keyword(s):  
Ambient Noise ◽  
Seismic Vulnerability ◽  
Amplification Factor ◽  
Noise Analysis ◽  
Spectral Ratio ◽  
Vulnerability Index ◽  
Dominant Frequency ◽  
Before And After ◽  
Hvsr Method ◽  
Index Value

Nyepi Day is a unique tradition where outdoor human activities stop 24 hours a day. Denpasar City is the region that has the most significant impact on this change because it is the capital province. This study aims to determine the effect of Nyepi on ambient noise in Denpasar on March 25, 2020. We installed a TDS sensor at the Denpasar Geophysics Station for 3x24 hours ie when Nyepi Day, before and after Nyepi as comparative data. The data is processed by the HVSR method to get the value of dominant frequency and amplification factor every hour. Compared to the day before and after Nyepi, the dominant frequency increased during Nyepi and the amplification factor decreased during Nyepi. Seismic vulnerability index value at Nyepi is 24 where there is a decrease of index 3,904 with a day before and after Nyepi. This is showed that Nyepi Day affected ambient noise in Denpasar.

scholarly journals Seismic Vulnerability Index Calculation for Mitigation Purposes at Cilacap District

2021 ◽  
Vol 873 (1) ◽  
pp. 012005
Author(s):  
Robert Edison ◽  
Supriyanto Rohadi ◽  
Yusuf Perdana ◽  
Nelly Florida Riama ◽  
Dwikorita Karnawati
Keyword(s):  
Seismic Vulnerability ◽  
Natural Vibration ◽  
Soil Layer ◽  
Vulnerability Index ◽  
Dominant Frequency ◽  
Key Factors ◽  
Minimum Duration ◽  
Central Java ◽  
Maximum Amplification ◽  
Dominant Frequencies

Abstract Seismic vulnerability index is one of the key factors in mitigation that shows the vulnerability of the soil layer beneath when passed through with a wave, the more vulnerable the soil layer, the more damage it done when an earthquake happens. Seismic vulnerability is calculated using two variables, that is dominant frequencies and amplification that are obtained by analyzing HVSR curve. HVSR are used to determine the dominant frequency by determining the maximum amplification in that area. HVSR curve is obtained by measuring microbemor data in 163 spots with 30 minutes-minimum duration in Cilacap with a portable seismograph. Mierotremor is a natural vibration that is caused by continuous vibration that come from beneath the surface, sometimes mixed up by the vibrabon that is caused by human activities such as pipe-flow, vehicles, etc. Thus, the purposes of this research are to determine which area is more vulnerable than others, based on the seismic vulnerability index, so it could be a reference for regional development to classified is it safe or unsafe to build in that area, remembering Cilacap is one of the most developed Districts in Central Java.

Seismic Vulnerability Mapping of the Lhokseumawe Region to Support the Spatial Plan of Lhokseumawe City

2020 ◽  
Vol 17 (7) ◽  
pp. 3153-3159
Author(s):  
Deassy Siska ◽  
Herman Fithra ◽  
Nova Purnama Lisa ◽  
Bustami ◽  
Sofyan ◽  
...  
Keyword(s):  
Seismic Vulnerability ◽  
Measurement Data ◽  
Vertical Component ◽  
Vulnerability Index ◽  
Disaster Mitigation ◽  
Eurasian Plate ◽  
Geological Conditions ◽  
Hvsr Method ◽  
The City ◽  
Tectonic Pattern

Microtremor is a weak vibration on the surface of the earth that takes place continuously due to sources of vibration such as earthquakes, human activities, industry and traffic (Daryono, 2009). Microtremor data measured obtained 3 signals whose components are vertical (Up and Down), horizontal (North-South), and horizontal (East-West) components. After the signal is obtained it can then be analyzed using the HVSR method and the dominant frequency and amplification values are obtained. The HVSR method compares the spectrum ratio of the horizontal component microtremor signal to its vertical component (Nakamura, 1989). Lhokseumawe City is administratively included in the Province of Nangroe Aceh Darussalam (NAD). In 2004 there was an earthquake of magnitude 9.2 on the Richter Scale in the southern waters of the city of Banda Aceh, which caused a devastating Tsunami. In this event many people lost about 250 thousand lives and lost property that is not small in number (Logan, 2014) Due to the active regional tectonic pattern, the NAD region is a disaster-prone region. The tectonic area of NAD is strongly influenced by the subduction area between the Indian-Australian oceanic plate (Indian Australian Plate) against the European-Asian continental plate (Eurasian plate). The tectonic pattern greatly influences the geological conditions in the waters of the study area. The purpose of this research is to provide preliminary knowledge in the use of microtremors for mapping seismic microzonation. This microzonation mapping is needed for earthquake disaster mitigation purposes, microtremor data analysis can provide information on the value of a place that is very important for earthquake resistant building planning. Building structures that have the same value as the land value will experience resonance in the event of an earthquake. Then the last is the Seismic Vulnerability Index Mapping which is useful for predicting unconsolidated sediment zones at the ground surface when an earthquake occurs, so that further studies for earthquake prone areas can be carried out. The stages of the research method carried out are measuring field data which is divided into several measurement points in each district in the city of Lhokseumawe. At each measurement point, a three-component seismometer is installed to obtain the results of the soil’s vulnerability in the area. Each measurement data is observed for 30 minutes at each point. The results of this study are the existence of areas that are very susceptible to seismic namely Ujung blang and Banda Sakti villages with seismic vulnerability index values (Kg) ranging from 0 cm/s2 -30542.32 cm/s2 The highest value is located at Ujong Blang villages which is 10397.1 cm/s2 This is closely related to the total amount of damage to buildings in Lhokseumawe City due to the 2004 earthquake.

scholarly journals Studi Mikrotremor dengan Metode Horizontal to Vertical Spectral Ratio (HVSR) di Tapak RDE, Serpong

EKSPLORIUM ◽  
2019 ◽  
Vol 40 (2) ◽  
pp. 105
Author(s):  
Eko Rudi Iswanto ◽  
Yuni Indrawati ◽  
Theo Alvin Riyanto
Keyword(s):  
Seismic Vulnerability ◽  
Nuclear Reactor ◽  
Amplification Factor ◽  
Power Reactor ◽  
Spectral Ratio ◽  
Vulnerability Index ◽  
Historical Records ◽  
Hvsr Method ◽  
Subsurface Investigation ◽  
Selection For

ABSTRAKBencana alam seperti kejadian gempa bumi dapat menyebabkan kerusakan pada area tapak dan infrastruktur termasuk fasilitas reaktor nuklir. Fenomena ini perlu dipahami secara komprehensif melalui catatan sejarah karakteristik dinamik tapak. Penggunaan mikrotremor dengan metode Horizontal to Vertical Spectral Ratio (HVSR) telah digunakan secara luas dalam investigasi bawah permukaan sejak satu dekade terakhir. Tujuan penelitian ini adalah mengetahui karakteristik geologi setempat dan karakteristik dinamis bawah permukaan. Penelitian ini mengaplikasikan penggunaan mikrotremor metode HVSR di tapak Reaktor Daya Eksperimental (RDE) di Serpong. Pengukuran dilakukan di 15 lokasi, kemudian data diolah dengan metode HVSR menggunakan perangkat lunak Geopsy. Hasil analisis menunjukkan bahwa Tapak RDE mempunyai nilai frekuensi dominan antara 3,06 Hz–23,27 Hz dan faktor amplifikasi 1,84–6,37. Bagian timur laut dan tenggara tapak memiliki indeks kerentanan seismik yang lebih tinggi dibandingkan dengan bagian lainnya. Oleh karena itu, pilihan lokasi gedung reaktor di area barat daya sudah tepat kerena memiliki faktor amplifikasi, ketebalan sedimen, dan indeks kerentanan seismik yang relatif rendah.ABSTRACTNatural disaster like earthquake can cause damage to the site and the infrastructure including nuclear reactor facilities. This phenomenon needs comprehensively understood through its dynamic characteristics historical records of the site. The use of Horizontal to Vertical Spectral Ratio (HVSR) method has been widely used for subsurface investigation since last decade. The aimed of the research is to obtain local geological and subsurface dynamic characetristics. This research is applying the use of HVSR method for Experimental Power Reactor (RDE) in Serpong. The measurements are in 15 locations, and then the data is processed by using Geopsy software. The analysis result shows that the RDE site has dominant frequncy values between 3.06 Hz–23.271 Hz and amplification factor 1.84–6.37. The northeast and southeast areas of the site have higher seismic vulnerability index than in other area. Therefore, the selection for reactor bulding location in the southwest area is proper because it has lower amplification factor, sedimen thickness, and seismic vulnerability index.

scholarly journals Interpretation of Dynamic Sediment Characteristic Based on Microtremor Analysis in Prambanan Region, Sleman Yogyakarta and Klaten Central Java, Indonesia

2018 ◽  
Vol 16 (1) ◽  
pp. 9 ◽  
Author(s):  
Hesti Hesti ◽  
Subagyo Pramumijoyo ◽  
Djoko Wintolo
Keyword(s):  
Shear Strain ◽  
Peak Ground Acceleration ◽  
Seismic Vulnerability ◽  
Vulnerability Index ◽  
Dominant Frequency ◽  
Severe Damage ◽  
Ground Acceleration ◽  
Central Java ◽  
Using Data ◽  
Very High

Yogyakarta earthquake on Mei 27, 2006 caused Prambanan area get quite severe damage marked by damageof resident house and Prambanan Temple.This study was conducted using data of microtremorsingle station and Yogyakarta earthquake 27 May 2006. Data were analyzed with microtremor HVSR methods to get the value of the dominant frequency (fo) and amplication (Ao).Furthermore, calculated the value of peak ground acceleration (PGA) in the layers of sedimen bedrock and seismic vulnerability index (Kg) to get ground shear strain value. Prambanan area has a dominant frequency (fo) value ranges from 0.63-6.78 Hz. Ground shear strain valueranges from 3,55.10-5 - 4,04.10-2.Each of these factors is then mapped with a division of 4 zones is very high, high, medium, and low.Based on the analysis of all these factors Prambanan area is an area that is vulnerable to the risk of earthquake events.

scholarly journals The Soft Layer Thickness Estimation using Microtremor Measurement to Identify Landside Potential in Watukumpul, Central Java, Indonesia.

2021 ◽  
Vol 6 (1) ◽  
pp. 16-23
Author(s):  
Urip Nurwijayanto Prabowo ◽  
Akmal Ferdiyan ◽  
Ayu Fitri Amalia
Keyword(s):  
Layer Thickness ◽  
Spectral Ratio ◽  
Dominant Frequency ◽  
Soil Slope ◽  
Soft Layer ◽  
Thickness Estimation ◽  
Central Java ◽  
Hvsr Method ◽  
Microtremor Measurement ◽  
Potential Area

Watukumpul is an area that is prone to landslides, so determining the soft layer thickness is very important to identify the landslide potential. The soft layer thickness can be estimated using microtremor signal measurements which analyzed using the Horizontal to Vertical Spectral Ratio (HVSR). In this study,we measured microtremor signal of 33location around Watukumpul, Pemalang, Central Java area to determine soft layer thickness. Micretremor signal was analyzed based on theHVSR method using Geopsy software and follow the standard of the Sesame Europan Project. The results of the HVSR method are the HVSR curve that fulfills the reliable curve standard. HVSR curve shows that the dominant frequency of soft layer ranges from 1.36 – 7.62 Hz and the amplification values ranges from 9.00 – 41.45. The soft layer thickness value in the study area ranges from 17.58 - 103.60 meters. The high landslide potential area are located at W7, W8, W18, W30 and W32 where has thin soft layer and high soil slope.

scholarly journals Earthquake and tsunami potential levels in Sulawesi (lesson learned earthquake West Sulawesi)

2021 ◽  
Vol 331 ◽  
pp. 07005
Author(s):  
Rio Khoirudin Apriyadi ◽  
Sobar Sutisna ◽  
Lasmono ◽  
Riskina Tri Januarti
Keyword(s):  
Seismic Vulnerability ◽  
Descriptive Analysis ◽  
Secondary Data ◽  
Soil Classification ◽  
Vulnerability Index ◽  
Tsunami Waves ◽  
Earthquake Resistant ◽  
Negative Impacts ◽  
Recovery Program ◽  
Post Disaster

Earthquake and tsunami disasters always bring negative impacts and losses for humans. The high frequency of earthquake disasters in Sulawesi and the massive impact of destruction and damage to infrastructure, loss of homes and property, and death of people are partly due to the lack of knowledge of this potential disaster by the surrounding community. Therefore, it is necessary to study the potential for earthquake and tsunami disasters on Sulawesi Island, and Lesson Learned about the Earthquake Disaster that has occurred in past. This study uses a qualitative method with a descriptive analysis design of secondary data obtained through a comprehensive literature review. The results showed that Sulawesi Island has a high potential for earthquake disasters, which is in the historical records of disasters, some of these earthquakes were accompanied by tsunami waves. The lesson that can be drawn from the earthquake in West Sulawesi is the potential for aftershocks after the opening earthquake and the main earthquake. In addition, the urgency of building earthquake-resistant housing structural mitigation is the key to safety during an earthquake. The post-earthquake recovery program in West Sulawesi requires further studies related to soil classification surveys, soil dominant periods, and soil seismic vulnerability index, as part of rebuilding a better and safer post-disaster area.

Seismic Vulnerability of Buried Water Pipes

2012 ◽  
Vol 518-523 ◽  
pp. 3740-3743 ◽  
Author(s):  
Halfaya Fatma Zohra ◽  
Mahmoud Bensaibi ◽  
Davenne Luc
Keyword(s):  
Seismic Vulnerability ◽  
Large Degree ◽  
Vulnerability Index ◽  
Water Network ◽  
Buried Pipelines ◽  
Sanitation Services ◽  
Quality Of Water ◽  
Good Classification

In south hemisphere regions mortality rates are closely related to infectious diseases that, to a large degree, depend on the quality of water consumed and on access to adequate sanitation services. A special attention must be paid to water quality particularly in case of an earthquake. Damage in this sector depends not only on the intensity of the disaster, but also on the vulnerability of buried pipelines. In this work, this vulnerability is studied through the use of a developed vulnerability index. This one allows a good classification and description of the seismic quality of the pipes taking into account the main parameters governing their vulnerability. A program including all informations that might be used was subsequently developed. The method was applied on the water network of Blida, a city in suburb of Algiers. The results obtained show that the established classification confirms the observed information in situ.

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