Mitigasi Bencana Berbasis Masyarakat pada Daerah Rawan Longsor di Desa Kalitlaga Kecamatan Pagetan Kabupaten Banjarnegara Jawa Tengah

This research was carried out due to the occurrence of mass movement in Kalitlaga Village Pagentan Sub-District Banjarnegara District, which was one of most dangerous area to mass movement in Province Central Java. Such movement resulted in damaged houses and road. This research was conducted to recognize and identify the direction and type of mass movement, to identify the triggering parameters and the cause of mass movement in order to provide an appropriate disaster mitigation recommendation and prevention method, as well as to introduce low cost early warning system based on community which enabled the community to prepare and operate the system in lessening the disaster risks. Secondary and primary data used in this research were derived from field investigation and study. The method of the study is analyzing the results of field study. To obtain the percentage of people understanding on disaster mitigation, landslide, and early warning system, interviews were conducted and the interviews outputs were processed using the SPSS software. Result shows that the landslide is predominantly northeastern ward and slump type of movement. To the number of leaky water pipe and infiltrations into the ground induce the mass movement. This movement is due to geological factors such as geomorphology factor and existence of clay stone as well as high rainfall factor. The community low understanding on disaster mitigation represents the reason to install simple and cheap early warning system community based disaster mitigation. Such mitigation is easier to apply than technology based mitigation. It is also more suitable prior to a disaster. Community participation and also support from government are the key efficacy of disaster mitigation

Foreshock–mainshock–aftershock sequence analysis of the 14 January 2021 (Mw 6.2) Mamuju–Majene (West Sulawesi, Indonesia) earthquake

AbstractWe present here an analysis of the destructive Mw 6.2 earthquake sequence that took place on 14 January 2021 in Mamuju–Majene, West Sulawesi, Indonesia. Our relocated foreshocks, mainshock, and aftershocks and their focal mechanisms show that they occurred on two different fault planes, in which the foreshock perturbed the stress state of a nearby fault segment, causing the fault plane to subsequently rupture. The mainshock had relatively few aftershocks, an observation that is likely related to the kinematics of the fault rupture, which is relatively small in size and of short duration, thus indicating a high stress-drop earthquake rupture. The Coulomb stress change shows that areas to the northwest and southeast of the mainshock have increased stress, consistent with the observation that most aftershocks are in the northwest.</jats:p

An integrated methodology to develop a standard for landslide early warning systems

Landslides are one of the most widespread and commonly occurring natural hazards. In regions of high vulnerability, these complex hazards can cause significant negative social and economic impacts. Considering the worldwide susceptibility to landslides, it is necessary to establish a standard for early warning systems specific to landslide disaster risk reduction. This standard would provide guidance in conducting landslide detection, prediction, interpretation, and response. This paper proposes a new standard consisting of seven sub-systems for landslide early warning. These include risk assessment and mapping, dissemination and communication, establishment of the disaster preparedness and response team, development of an evacuation map, standardized operating procedures, installation of monitoring and warning services, and the building of local commitment to the operation and maintenance of the entire program. This paper details the global standard with an example of its application from Central Java, one of 20 landslide-prone provinces in Indonesia that have used this standard since 2012