scholarly journals INDEK KERENTANAN DAN AMPLIFIKASI TANAH AKIBAT GEMPA DI WILAYAH UNIVERSITAS MUHAMMADIYAH JEMBER

2015 ◽  
Vol 12 (2) ◽  
Author(s):  
Muhtar . ◽  
Arief Alihudien
Keyword(s):  
Seismic Vulnerability ◽  
Multicriteria Analysis ◽  
Vulnerability Index ◽  
Research Area ◽  
Disaster Mitigation ◽  
Mitigation Measures ◽  
Land Values ◽  
Soil Amplification ◽  
Residential Areas ◽  
The Impact

INDEK KERENTANAN DAN AMPLIFIKASI  TANAH AKIBAT GEMPA DI  WILAYAH UNIVERSITAS MUHAMMADIYAH JEMBERVulnerability and Soil Amplification Index Due to Earthquake in The University Muhammadiyah JemberMuhtar1 & Arief Alihudien21Jurusan Teknik Sipil Fakultas Teknik – Universitas Muhammadiyah Jember2Jurusan Teknik Sipil Fakultas Teknik – Universitas Muhammadiyah JemberAlamat Korespondensi : Perum Taman Bambu B-01 Jember 68124Email : 1)[email protected] phenomena of earthquakes until now could not be predicted and the exact time it happened. Earthquake danger can not be avoided but its impact can be reduced through assessment activities characteristic earthquakes in a region that will be applied in the selection of methods and policies for disaster risk management. Residential areas adjacent to the source of the earthquake is an earthquake-prone area so, therefore it is necessary strategic steps to protect the public and disaster mitigation measures are an attempt to reduce or minimize the impact of loss or damage that may be caused by the disaster. The study was conducted to provide information to the seismic vulnerability using multicriteria analysis of conditions in the region include University of Muhammadiyah Jember dominant period land values   and the value of the amplification factor. The experiment was conducted using subsurface observation with mikrotremoR. From the results of geological studies research area is the basic constituent of igneous rocks such as tuff Argopuro. The results showed that the natural frequency of the soil and soil amplification is at 2,692 and 4,625 Hz. whereas soil vulnerability index value is equal to 7,946.Key Words : seismic, vulnerability, indexAbstrakFenomena alam gempa bumi sampai saat ini belum bisa diprediksi dan waktu yang tepat itu terjadi . Bahaya gempa tidak dapat dihindari namun dampaknya dapat dikurangi melalui kegiatan penilaian gempa bumi karakteristik di daerah yang akan diterapkan dalam pemilihan metode dan kebijakan untuk manajemen risiko bencana . Daerah pemukiman yang berdekatan dengan sumber gempa adalah daerah rawan gempa sehingga , oleh karena itu langkah-langkah strategis yang diperlukan untuk melindungi tindakan publik dan mitigasi bencana merupakan upaya untuk mengurangi atau meminimalkan dampak kerugian atau kerusakan yang mungkin disebabkan oleh bencana. Penelitian ini dilakukan untuk memberikan informasi kepada kerentanan seismik menggunakan analisis multikriteria kondisi di kawasan ini mencakup Universitas Muhammadiyah Jember nilai tanah periode dominan dan nilai faktor amplifikasi . Penelitian dilakukan dengan menggunakan observasi bawah permukaan dengan mikrotremoR. Dari hasil daerah penelitian studi geologi adalah konstituen dasar batuan beku seperti tuf Argopuro . Hasil penelitian menunjukkan bahwa frekuensi alami amplifikasi tanah dan tanah di 2,692 dan 4.625 Hz . sedangkan nilai indeks kerentanan tanah sama dengan 7946 .Kata Kunci : seismik , kerentanan , indeks

scholarly journals Vulnerability Of The Garut District Region In Tarogong Kalam, Tarogong Kidul, Garut Kota, And Karang Pawitan Sub-District Based On Microtremor Measurement

2020 ◽  
Vol 11 (1) ◽  
pp. 11
Author(s):  
Rahmat Setyo Yuliatmoko
Keyword(s):  
Seismic Vulnerability ◽  
Vulnerability Index ◽  
Dominant Frequency ◽  
Mitigation Measures ◽  
Ratio Method ◽  
Tectonic Earthquake ◽  
Wave Amplification ◽  
Geological Conditions ◽  
Microtremor Measurement ◽  
The Impact

The Tasikmalaya M 7.3 earthquake on September 2, 2009 had an impact on Garut, damaged infrastructure and claimed many lives. From the search results there were five areas that were severely damaged by tectonic earthquake shocks, which included Pemeungpeuk, Cisompet, Cikelet, Peundeuy and Banjarwangi Subdistricts, so that earthquake mitigation measures were needed. One of the mitigations that can research how the impact is if the potential for earthquake disasters occur below the southern surface of Java. The final objective of this research is to map disaster-prone zones in Tarogong Kaler, Tarogong Kidul, Garut City, and Karang Pawitan, Garut Subdistrict, based on dominant frequency values, Vs30, seismic vulnerability indexes, and GSS (Ground Shear Strains) so that they can know the land movement that is. Retrieval of data in this study by measuring geophysicaly methods in the field. Processing data using HVSR (Horizontal to Vertical Spectra Ratio) method, then mapped with ArcGis to interpret the zoning of the study area. Based on the research, we known that the dominant frequency distribution value is between 1-5.2 Hz. The seismic vulnerability index values calculated the study area are between 3 – 45, GSS values in the study area between 3 ×10-4 - 42×10-4. By looking at the spatial distribution of the values of f0, Kg and GSS the areas of Karangmulya, Jatiasih, Sidanggalih and Godog villages are types of young volcanic sediments classified as soft soils that are easily to wave amplification and earthquake vibrations, so that they are easily damaged during large earthquakes. in this region qualify as earthquake resistant buildings to minimize damage and losses, while Sukabakti, Kersamenak, Sukajaya, and Mekargalih villages in the west with the geological conditions of the surrounding area which is hard land so that it will be safer when an earthquake occurs.

scholarly journals Analysis of Earthquakes Potential Damages as a Disaster Mitigation Effort

2021 ◽  
Vol 2 (1) ◽  
pp. 20-23
Author(s):  
Alen Fezi Loveka ◽  
Henny Johan ◽  
Rendy W. Wardana
Keyword(s):  
Shear Strain ◽  
Seismic Vulnerability ◽  
Vulnerability Index ◽  
Disaster Mitigation ◽  
Sediment Layer ◽  
Residential Areas ◽  
Literature Study ◽  
Geological Conditions ◽  
Potential Damage ◽  
Mitigation Effort

Muara Bangkahulu District is one of Bengkulu Province Subdistricts, which is used as a place for higher education service centers, government office centers, and community residential areas. Muara Bangkahulu has the risk of being affected by an earthquake caused by its geological conditions. To avoid the potential damage due to earthquake, the PGA parameters, seismic vulnerability index, ground shear strain, and thickness of sediment layer (h) were analyzed in Muara Bangkahulu District as an effort to mitigate earthquakes. The purpose of this study is to describe the potential damage caused by the earthquake in Muara Bangkahulu District as a disaster mitigation effort. This research was a qualitative descriptive study using the literature study method. The results of the literature study which showed the value of PGA produced between 184.22 gal to 532.92 gal. Distribution of seismic vulnerability index values between 0.56 to 7.95. Distribution of ground shear strain values between 5.14 x10-5 to 7.42 x10-4. The thickness of the sediment layer (h) ranged from 8.13 meters to 61.31 meters. The largest PGA, IKS, GSS and h values are in Kualo Beach which is estimated to have a high level of risk for earthquake disasters with a correlation more than 74%. Thus, it can be concluded that the vicinity of Kualo Beach is the most potential and prone to earthquake damage.

scholarly journals Local Site Effects Evaluation Using Microtremor Measurements at North Side of Pandan Mountain

2017 ◽  
Vol 1 (2) ◽  
pp. 89 ◽  
Author(s):  
Samsul Hidayat ◽  
Dwa Desa Warnana ◽  
Sorja Koesuma ◽  
C Cari
Keyword(s):  
Natural Frequency ◽  
Amplification Factor ◽  
Spectral Ratio ◽  
Vulnerability Index ◽  
Disaster Mitigation ◽  
Residential Areas ◽  
Weak Zone ◽  
Local Site ◽  
Index Value ◽  
The Impact

Disaster mitigation has been undertaken to reduce the impact of loss or damage caused by the earthquake. For disaster mitigation purpose, it is necessary to conduct a local geological assessment. The horizontal to vertical spectral ratio (HVSR) of microtremor analysis is very popular in the context of seismic micro-zonation. Microtremor method is cheap, data acquisition is easy, and does not cause noise, so suitable for use in residential areas. This research aims to determine the distribution of the natural frequency value, the amplification factor value, and the soil vulnerability index value. This study was conducted geographically between 7°26'17.45" – 7°26'53.16" S and 111°47'14.76" – 111°48'7.06" E. Data processing using HVSR analysis method on Easy HVSR software. The results showed that the natural frequency (<em>f<sub>o</sub></em>) values range 0,95 Hz to 8,3 Hz and the amplification factor values range 2,05 to 8,67. From the result data of the natural frequency and the amplification factor, the soil vulnerability index can be calculated. The vulnerability index (Kg) value ranges from 1,09 to 68,33. The northeast side of the study area is indicated as a weak zone where have high potential to damage when the earthquake occurred.

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.

scholarly journals Dynamic Assessment of Flood Hazard Based on Points-of-Interest Data

2021 ◽  
Author(s):  
Xin Su ◽  
Weiwei Shao ◽  
Jiahong Liu
Keyword(s):  
Hazard Assessment ◽  
Flood Hazard ◽  
Dynamic Assessment ◽  
Disaster Mitigation ◽  
Mitigation Measures ◽  
Urban Flood ◽  
Flood Prevention ◽  
Points Of Interest ◽  
High Degree ◽  
The Impact

In order to better formulate flood prevention and disaster mitigation measures and reduce the impact of urban flood on social development, it is necessary to conduct a scientific and accurate flood hazard assessment. The development of big data technology has brought new opportunities for flood hazard assessment. This study used a coupling model to simulate urban flood, and used the HR method to classify flood hazard. The dynamic change process of two types of Points-of-Interest(POIs) for catering services and living services under different flood hazard degrees were counted. The results showed that (1) In the northern part of the basin, mountainous, impervious ground and the lack of effective drainage channels have combined to cause more serious floods; (2) The flood hazard were mainly low-degree in the study area. Moderate flood hazard mainly occurred in farmland and built-up land. High-degree and extreme-degree flood hazard mainly occurred on both sides of rivers in the northwest of the basin; (3) Affected by the rainfall pattern, the number of POI affected by flood presented the characteristics of “three stages” under four flood hazard degrees; (4) The POIs of the two services was most seriously affected by the flood when the rainfall just stopped; (5) In terms of the proportion of POIs affected by floods, the impact of floods on the two industries is basically the same, but from the perspective of the number of POIs affected by floods, catering services will be more affected; (6) The spatial location of the POIs led to a slight difference in the trend of the number of POIs under high-degree and extreme-degree flood hazard. This study provided a new method for urban flood hazard dynamic assessment, which could help decision makers formulate more targeted flood prevention and disaster mitigation measures

scholarly journals A Microtremor Survey to Identify Seismic Vulnerability Around Banda Aceh Using HVSR Analysis

Elkawnie ◽  
2020 ◽  
Vol 6 (2) ◽  
pp. 342
Author(s):  
Andrean Vesalius Hasiholan Simanjuntak ◽  
Yusran Asnawi ◽  
Muksin Umar ◽  
Syamsul Rizal ◽  
Muhammad Syukri
Keyword(s):  
Seismic Vulnerability ◽  
Sampling Rate ◽  
Vulnerability Index ◽  
Disaster Mitigation ◽  
Seismic Waveform ◽  
Geological Conditions ◽  
Spectrum Ratio ◽  
Potential Damage ◽  
Banda Aceh ◽  
Microtremor Survey

Abstract: Banda Aceh can be categorized as an earthquake-prone city because of the existence of two active segments namely Seulimeum and Aceh. Both segments are considered to provide great potential damage in the future. In this article, we conduct a microtremor survey in the Peukan Bada, sub-part of Banda Aceh city, to learn the vulnerability level and support disaster mitigation plan. A total of 20 sites were measured with a seismometer to record the seismic waveform. The waveform was recorded in 45 minutes with a sampling rate of 100 sps and has analyzed using the horizontal-vertical spectrum ratio (HVSR). The results obtained are the dominant parameters, such as the period with a range of 0 – 0.5s, frequency with a range of 0 – 6 Hz, seismicity vulnerability index with a range of 0.1 – 0.5. The result was relevant to the geological conditions of Peukan Bada that dominated by alluvial rocks and mud sediments. The level of vulnerability (Kg > 1.0) obtained is quite high and proportional to the soil type that can amplify the seismic waveform. The results obtained are expected to be a supporting study of disaster mitigation and understand the geological conditions of Banda Aceh in terms of seismic vulnerability.Abstrak: Banda Aceh dapat dikategorikan sebagai kota rawan gempa karena adanya dua segmen aktif yaitu Seulimeum dan Aceh. Kedua segmen tersebut bisa memberikan potensi kerusakan yang besar di masa mendatang. Pada tulisan ini, kami melakukan survei mikrotremor di Kecamatan Peukan Bada, salah satu sub-wilayah kota Banda Aceh, untuk mempelajari tingkat kerentanan dan mendukung rencana mitigasi bencana. Sebanyak 20 lokasi diukur dengan seismometer untuk merekam bentuk gelombang seismik. Gelombang direkam selama 45 menit dengan jumlah sampel 100 sps dan dianalisis menggunakan horizontal-vertical spectrum ratio (HVSR). Hasil yang diperoleh adalah parameter yang dominan yaitu periode dengan rentang 0 – 0,5s, frekuensi dengan range 0 - 6 Hz, indeks kerentanan kegempaan dengan rentang 0,1 – 0,5. Hasil tersebut relevan dengan kondisi geologi Peukan Bada yang didominasi oleh batuan aluvial dan endapan lumpur. Tingkat kerentanan (Kg > 1,0) yang diperoleh cukup tinggi dan sebanding dengan jenis tanah yang dapat memperbesar gelombang seismik. Hasil yang diperoleh diharapkan dapat menjadi pendukung kajian mitigasi bencana dan memahami kondisi geologi Banda Aceh dari segi kerentanan seismik.

scholarly journals Understanding the Resilience of Different Farming Strategies in Coping with Geo-Hazards: A Case Study in Chongqing, China

2020 ◽  
Vol 17 (4) ◽  
pp. 1226 ◽  
Author(s):  
Li Peng ◽  
Jing Tan ◽  
Wei Deng ◽  
Ying Liu
Keyword(s):  
Social Support ◽  
Logit Model ◽  
Adaptation Strategy ◽  
Disaster Mitigation ◽  
Mitigation Measures ◽  
Crop Loss ◽  
Smallholder Farming ◽  
Agricultural Income ◽  
Disaster Experience ◽  
The Impact

Adjusting farming strategies are adaptive behaviors to cope with hazard risks. However, few studies have studied rural and remote mountain areas in China with little known about “farmers’ adaptation under the impact of geo-hazards”. Unlike traditional farmers’ behavioral adaptation studies, in this study, we focused on the resilience of farmers’ behavioral mechanisms to address local hazards such as geo-hazards. Our data were acquired through questionnaire responses (N = 516) in mountainous hazard-prone areas in Chongqing, China. The binary logit model and multinomial logit model were used to investigate the obstacles to different farming strategies and the determinants of adaptation strategy choice, focusing on the effects of disaster experience and social support on the adaptation strategy resilience. The results show that the most common adaptation strategy was adjusting crop varieties, and the largest adaptation obstacle was a lack of funds. Additionally, the age of the smallholder, farming acreage, agricultural income, social support, and disaster experience significantly increased the possibility of farmers adjusting their agricultural production. Of these, smallholder agricultural income, state disaster subsidy, the presence of disaster prevention construction, the smallholder’s property, and the presence of disaster-caused crop loss experience were the most important factors affecting a farmer’s adaptation strategy. In particular, farmers were more sensitive to disaster-caused property loss than to disaster-caused crop loss. This study can provide implications for the government to formulate disaster mitigation measures and for farming strategies at the smallholder level.

A Fundamental Research on Countermeasure of Disaster Mitigation and Impact Force to Cause Drifting Ship

2017 ◽  
Author(s):  
Kazuki Murata ◽  
Koichi Masuda ◽  
Tomoki Ikoma ◽  
Hiroaki Eto ◽  
Yasuhiro Aida ◽  
...  
Keyword(s):  
Impact Force ◽  
Disaster Mitigation ◽  
Mitigation Measures ◽  
Coastal Structures ◽  
Mps Method ◽  
Port Facilities ◽  
Shipping Containers ◽  
Fundamental Research ◽  
Moving Particle ◽  
The Impact

The damage investigations that followed the Great East Japan Earthquake revealed that automobiles, shipping containers, and even ships themselves had been caught up in the resulting tsunami before being hurled into various port facilities, causing immense damage. The damage characteristics of such collisions must be an integral part of disaster mitigation measures aimed at reducing damage due to drifting ships. When considering the impact force of massive vessels on port facilities, it is necessary to take into account the changes in the drift velocity of the vessels due to waves reflected from the facilities and other coastal structures. In previous studies, the moving particle semi-implicit (MPS) method has been adopted to examine cascading tsunami flotsam damage by means of numerical simulations. In the present study, we use the MPS method to examine the drifting behavior and impact force of ships moored to an actual harbor, taking into account waves reflected from coastal area structures. Based on the results, we discuss the applicability of this method to disaster mitigation measures.

scholarly journals Collective space on residential as a resilience measure to disaster mitigation earthquakes and liquefaction

2022 ◽  
Vol 1212 (1) ◽  
pp. 012003
Author(s):  
A Mulyati ◽  
M Najib ◽  
A M Y Astha
Keyword(s):  
Spatial Patterns ◽  
Residential Buildings ◽  
Environmentally Friendly ◽  
Public Spaces ◽  
Building Construction ◽  
Disaster Mitigation ◽  
Structural Systems ◽  
Residential Areas ◽  
The Impact ◽  
Environmental Infrastructure

Abstract Disasters have just hit Palu, Sigi, and Donggala, resulting in the fall of so many victims, not only humans but also city and village physicals (residential buildings, facilities, and infrastructure). Several villages hit by the disaster were hamlet 3 Vou, Langaleso village, Dolo sub-district, Jono Oge village, Biromaru sub-district, and Sigi district. The village’s condition was damaged, but most of the buildings and plants were lost to the mud. Settlement neighborhoods that should be full of activity are nowhere to be seen, and people become apathetic. They just accept this situation and are always waiting for help. Huntara, a form of assistance provided by funders, temporarily occupy the settlers’ land because the condition of the land or land needs to be cleared for the rebuilding process. The provision of inclusive spaces is one of the efforts to mitigate disasters in residential areas, namely public spaces that can be used by all settlers. These spaces must be safe and provide comfort, easy to reach, and become part of the residential environment. Village arrangement is one way that can be done to minimize the impact of a disaster. Arrangement of buildings, facilities, and environmental infrastructure are necessary not to create chaos in development. Also, aspects of environmentally friendly residential (village) spatial patterns, structural systems, and building construction that meet the requirements (SNI), the application of local and humane wisdom are no less important to consider in the process of procuring inclusive spaces in settlements, structuring villages, especially after a disaster.

Climate variability and farmer's vulnerability in a flood‐prone district of Assam

2012 ◽  
Vol 4 (2) ◽  
pp. 179-200 ◽  
Author(s):  
Swati Chaliha ◽  
Asmita Sengupta ◽  
Nitasha Sharma ◽  
N.H. Ravindranath
Keyword(s):  
Climate Variability ◽  
Adaptive Capacity ◽  
Secondary Data ◽  
Vulnerability Index ◽  
Mitigation Measures ◽  
Natural Phenomenon ◽  
Indicator Method ◽  
Content Type ◽  
Indian State ◽  
The Impact

PurposeThe Indian state of Assam is situated in a high rainfall zone and the river Brahmaputra flowing through the state causes annual floods which adversely impact the agro‐economic base of the region. The situation is likely to become exacerbated under the impact of climate change. The purpose of this paper is to quantify the vulnerability of the farmers in Assam to floods in the scenario of the present climate variability taking a case study of the Majuli Island of Jorhat district.Design/methodology/approachThe current vulnerability of the farmers in the Majuli Island of Jorhat district of Assam is quantified using the “indicator method”. A Composite Vulnerability Index is calculated taking into account various indicators reflective of the exposure, sensitivity and the adaptive capacity of the farmers' community to floods. The indicators have been quantified based on the data obtained from household surveys and participatory rural appraisals (PRAs) in the villages and secondary data sources.FindingsThe results show that biophysical factors have the greatest impact on the overall vulnerability of the study area and that strengthened adaptive capacity, proper scientific planning and management is required to protect the Majuli Island from the adverse effects of recurrent floods.Originality/valueThis paper shows that the more decentralized the spatial unit of vulnerability assessment is, the more helpful it would be for policy makers and stakeholders to formulate efficient mitigation measures, plan apposite developmental programmes and improve the adaptive capacity of Assam as a whole to face the natural phenomenon of floods.

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