Character of community response to volcanic crises at Sinabung and Kelud volcanoes

Pyroclastic density currents (PDCs) are dangerous multiphase flows originating from volcanic eruptions. PDCs cause more than a third of volcanic fatalities globally and, therefore, development of robust PDC hazard models is a priority in volcanology and natural hazard science. However, the complexity of gas–particle interactions inside PDCs, as well as their hostile nature, makes quantitative measurements of internal flow properties, and the validation of hazard models, challenging. Within the last decade, major advances from large-scale experiments, field observations and computational and theoretical models have provided new insights into the enigmatic internal structure of PDCs and identified key processes behind their fluid-like motion. Recent developments have also revealed important links between newly recognized processes of mesoscale turbulence and PDC behaviour. In this Review, we consider how recent advances in PDC research close the gaps towards more robust hazard modelling, outline the need to measure the internal properties of natural flows using geophysical methods and identify critical future research challenges. Greater understanding of PDCs will also provide insights into the dynamics of other natural gravity currents and high-energy turbulent multiphase flows, such as debris avalanches and turbidity currents. Pyroclastic density currents are complex multiphase flows originating from volcanic eruptions and account for almost a third of volcanic fatalities globally. This Review discusses recent advances in understanding of the complex internal processes within pyroclastic density currents and how these influence the flow dynamics and hazard footprints.

Multiphase flow behaviour and hazard prediction of pyroclastic density currents

After 53 years of quiescence, Mount Agung awoke in August 2017, with intense seismicity, measurable ground deformation, and thermal anomalies in the summit crater. Although the seismic unrest peaked in late September and early October, the volcano did not start erupting until 21 November. The most intense explosive eruptions with accompanying rapid lava effusion occurred between 25 and 29 November. Smaller infrequent explosions and extrusions continue through the present (June 2019). The delay between intense unrest and eruption caused considerable challenges to emergency responders, local and national governmental agencies, and the population of Bali near the volcano, including over 140,000 evacuees. This paper provides an overview of the volcanic activity at Mount Agung from the viewpoint of the volcano observatory and other scientists responding to the volcanic crisis. We discuss the volcanic activity as well as key data streams used to track it. We provide evidence that magma intruded into the mid-crust in early 2017, and again in August of that year, prior to intrusion of an inferred dike between Mount Agung and Batur Caldera that initiated an earthquake swarm in late September. We summarize efforts to forecast the behavior of the volcano, to quantify exclusion zones for evacuations, and to work with emergency responders and other government agencies to make decisions during a complex and tense volcanic crisis.

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The 2017–19 activity at Mount Agung in Bali (Indonesia): Intense unrest, monitoring, crisis response, evacuation, and eruption

The Community in America

Overview of the eruptions of Sinabung Volcano, 2010 and 2013-present and details of the 2013 phreatomagmatic phase

Sinabung, the sleeping volcano since the year 1600 awakened and erupted in 2010, 2013, and 2015. The volcano is located in Karo District, North Sumatera Province, Indonesia, geographically on 3 o 10’ North Latitude, and 98 o 23, East Longitude. It is about 2460 m high above sea level, and the highest volcano of Sumatera. Sinabung has been estimated about 400 years long inactive, therefore categorized as B type of volcano. It was astonishing; Sinabung erupted on 27 August 2010, again on November 2013, and in May to June 2015. Awakening of the volcano hypothetically has been triggered by last decade earthquakes happened in North Sumatera and surrounding area, including the great earthquake and tsunami of Aceh, December 2004 that caused about 115,000 people died. Because of the volcano has been slept for a long time, people live in the surrounding area were not prepared yet to facing the eruption. In order to reduce the risk such a countermeasure should be developed especially that directly involving local people participation. In this case such an environmental communication system is needed to be developed, it is SMS gate way for disaster early warning system.

https://www.jurnal.ugm.ac.id/ijg/article/download/17574/pdf

Eruption Characteristic of the Sleeping Volcano, Sinabung, North Sumatera, Indonesia, and SMS Gateway for Disaster Early Warning System

Earthquakes, tsunami, landslide and volcanic eruptions occur frequently in Indonesia. The frequency of events combined with high population and widely varied culture, differing levels of education and knowledge of natural hazards, as well as varied income, combine to give the country a high risk for natural disaster. Communication in hazard zones is affected by a number of factors such as: differing terminology and perceptions of hazards by the public, scientists, and disaster managers; how scientists and emergency managers communicate information; and how effectively the media transfers the information to the public. Communication is also complicated by culture, social factors and a wide variety of local languages. In Indonesia, disaster mitigation efforts at the national level are coordinated by National Disaster Management Agency; whereas, provincial and regional disaster agencies are responsible for managing within their domains and in most cases local authorities are responsible for specific mitigation actions, such as evacuations. Transferring hazard information is an important process in mitigation. In order to obtain efficient communication with the public, trusting relationships between scientists and communities are required. An understanding by scientists and emergency managers of local culture, local languages and people’s character facilitates communication and contributes to trust. In addition, the media used for information can contribute significantly to improving communication. Hazard communication also aims to improve the capacity of communities through enhancing their knowledge and strengthening of their mitigation institutions. In hazard zones, effective mitigation requires participation and community empowerment with activities before, during and after disasters. A lesson learned from numerous volcanic eruptions in Indonesia is that each volcano has a different character, based not only the physical characteristics of eruptions but also on geographic, social and cultural features. These features result in different responses of people during crises and they influence the way scientists and government agencies communicate and deal with the process of evacuation and repatriation.

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Integrating Social and Physical Perspectives of Mitigation Policy and Practice in Indonesia

DOI: 10.17014/ijog.v6i2.116 Merapi Volcano in Central Java has been the most active volcano during Holocene time. As a strato volcano, Merapi exhibits alternating volcanic activities of effusive and explosive characters and self destruction. The explosivity index has evolved during the last ten thousand years. The effusive activities were characterized by the occurrence of lava flows, the development of lava dome, and the production of the “nuee ardente d’avalanche” called Merapi type. The explosive stage is frequently accompanied by the occurence of pyroclastic flows. The present investigation is attempted to reveal the relationship between the characteristics of lahar and the evolution of the activity of Merapi Volcano. The quantitative analysis was focused on the size and shape of the lahar components particularly that of pumice as the main indicators in 73 measured stratigraphic columns of lahar deposits. In addition, the main chemical element rim structures of hornblende identified in lahar components indicate the different lahar units. There are five lahar units and five groups of Merapi activities which can be distinguished. It can be concluded that the characteristics of lahar reflect the evolution of the activities in the past. The risk analyses of Merapi Volcano therefore can be enlarged to cover the possible hazard based on the lahar characteristics.

http://ijog.bgl.esdm.go.id/index.php/IJOG/article/download/116/116

The Characteristics of Lahar in Merapi Volcano, Central Java as the Indicator of the Explosivity during Holocene

This study aims to find a model of environmental communications for disaster mitigation eruption of Mount Sinabung at Karo district of North Sumatra. This research also aims at increasing public awareness and government in improving the effectiveness of disaster communications in Sinabung. Organizational Information Theory is used as concept of his study. The research uses descriptive qualitative method by employing data collection techniques such as Focus Group Discussion (FGD) and interviews on communication training for disaster mitigation at Sinabung. The research located in Karo district of North Sumatra, particularly at Regional Disaster Management Agency (BPBD), Department of Communication and Information Technology, and Kesbanglinmas, Head sub district, Head of village, and volunteers. The result of this research is a model of environmental communications to support early warning system in Sinabung.

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Eko Teguh Paripurno

Papers

Character of community response to volcanic crises at Sinabung and Kelud volcanoes

Eruption Characteristic of the Sleeping Volcano, Sinabung, North Sumatera, Indonesia, and SMS Gateway for Disaster Early Warning System

Integrating Social and Physical Perspectives of Mitigation Policy and Practice in Indonesia

The Characteristics of Lahar in Merapi Volcano, Central Java as the Indicator of the Explosivity during Holocene

Komunikasi Lingkungan Untuk Mitigasi Bencana Erupsi Gunung Sinabung