Petrology,geochemistry,and crystal size distribution of the basaltic andesite-dacite association at Mt.Sumbing,Central Java,Indonesia:Insights to magma reservoir dynamics and petrogenesis

Ten rock samples consisting of one pyroclastic density current(PDC1)deposit,seven lava flows(LF1–7),and two summit lava domes(LD1,2)were studied to understand the petrogenesis and magma dynamics at Mt.Sumbing.The stratigraphy is arranged as LF1,PDC1,LF2,LF3,LF4,LF5,LF6,LF7,LD1,and LD2;furthermore,these rocks were divided into two types.TypeⅠ,observed in the oldest(LF1)sample,has poor MgO and high Ba/Nb,Th/Yb and Sr.The remaining samples(PDC1–LD2)represent typeⅡ,characterized by high MgO and low Ba/Nb,Th/Yb and Sr values.We suggest that type I is derived from AOC(altered oceanic crust)-rich melts that underwent significant crustal assimilation,while typeⅡoriginates from mantle-rich melts with less significant crustal assimilation.The early stage of typeⅡmagma(PDC1–LF3)was considered a closed system,evolving basaltic andesite into andesite(55.0–60.2 wt%SiO_(2))with a progressively increasing phenocryst(0.30–0.48φ_(PC))and decreasing crystal size distribution(CSD)slope(from-3.9 to-2.9).The evidence of fluctuating silica and phenocryst contents(between 55.9–59.7 wt%and 0.25–0.41φ_(PC),respectively),coupled with the kinked and steep(from-5.0 to-3.3)CSD curves imply the interchanging condition between open(i.e.,magma mixing)and closed magmatic systems during the middle stage(LF4–LF6).Finally,it underwent to closed system again during the final stage(LF7–LD2)because the magma reached dacitic composition(at most 68.9 wt%SiO_(2))with abundant phenocryst(0.38–0.45φ_(PC))and gentle CSD slope(from-4.1 to-1.2).

An Institutional Model for Collaborative Disaster Risk Management in the Southern African Development Community(SADC) Region

This article presents and argues for a collaborative model for disaster risk management in the Southern African Development Community(SADC).The research employed a qualitative study through a literature review and empirical research through focus group interviews to realize its objectives.As a key theory of multinational collaboration,neoliberal institutionalism—a subset of the international relations theory—was used to develop the SADC institutional collaborative model.The model combined the theoretical,political,and technical dimensions of collaboration to enhance buy-in for the disaster risk management and reduction function of governments.The model demonstrates the need for a multidisciplinary approach to achieving disaster risk management and reduction in the SADC and elsewhere,if the developmental objectives of disaster risk reduction are to be realized without interference in the domestic affairs of the member countries.This model is therefore grounded in seeking consensus and cooperation among cooperating states in a quest to ensure national implementation of the regional framework on disaster risk reduction.

Perceived Adverse Effects of Separating Government Institutions for Disaster Risk Reduction and Climate Change Adaptation Within the Southern African Development Community Member States

Integration of disaster risk reduction(DRR)and climate change adaptation(CCA)is widely recognized as a solution for reducing the risk and impacts of disasters.However,successful integration seems elusive,and the two goals continue to function in isolation and in parallel.This article provides empirical insights into the perceived effects of separating government institutions for DRR and CCA within the Southern African Development Community member states.A mixed method research design was applied to the study.A total of 40 respondents from Botswana,Eswatini(until April 2018 Swaziland),Madagascar,Malawi,Namibia,South Africa,Tanzania,Zambia,and Zimbabwe participated in face-to-face interviews or an online survey.Five major effects of separating the organizations for DRR and CCA that impede efforts to reduce disaster risk coherently were identified:duplication of services,polarization of interventions,incoherent policies,competition for the same resources,and territorial contests.Given the continued fragmentation of institutions for DRR and CCA,highlighting these effects is important to emphasize the need for integrated approaches towards the reduction of disaster risk.

Financing Disaster Risk Reduction:Exploring the Opportunities,Challenges,and Threats Within the Southern African Development Community Region

The Southern African Development Community(SADC)region,a regional economic body comprised of 16 member states,is one of our planet's most vulnerable regions to natural hazards,and has a complex disaster risk profile.The region has sustained several disasters over the past decades.These events include annual floods in 2004-2019 and extreme droughts(1990-1993);other climate-induced disasters,such as cyclones,also have had devastating impacts,particularly on the Indian Ocean island states and east coast countries.To reduce the risk and impacts of dis asters,governments must invest in disaster risk reduction(DRR).However,interventions aimed at reducing social and economic vulnerability and investing in longterm mitigation activities are often few,poorly funded,and insignificant in comparison with money spent on humanitarian assistance,dis aster relief,and post-disaster reconstruction.This study investigated whether DRR is adequately funded within SADC member states in light of the high stakes in human life,infrastructure,and economic losses and the potential savings involved.The study applied a qualitative research design with data collected through semistructured interviews and focus group discussions.Respondents were selected purposefully and through snowball sampling with a total of 67 respondents from Botswana,Eswatini,Namibia,South Africa,and Zimbabwe participating in the study.The study findings reveal that DRR is inadequately funded in all the member states consulted in comparison to funding allocated to disaster response.In light of the underfunding experienced by DRR activities,this study provides a platform for lobbying and advocacy for adequate funding for DRR.

Enhancing Coordination for Effective Management of Oil Spill Pollution in South Africa

Although multi-sectoral coordination in disaster risk management has been progressing in South Africa for over two decades,there has been limited commitment to an integrated regime in managing marine oil spill incidents.Poor incident management persists despite the availability of data,protocols,legislation,and resources housed in different government and private sector entities.This study identified practices that enhance a coordination process for the effective management of oil spill pollution.A grounded theory approach is applied to the coordination issue,which is characterized by an interactive process of simultaneously considering theoretical grounding during our empirical research.Empirical evidence includes observations of 47meetings and three oil spill exercises with 79 delegates from 32 different organizations,which supports the coordination process of instituting a national Incident Management System for marine oil spills in South Africa.An additional 44 individual open-ended questionnaires supplement this earlier body of evidence for data triangulation and validation.Analysis of development of the Incident Management System process revealed that,when designing a novel long-term project that is reliant on a shared vision from multiple organizations,enhanced coordination and collaboration for successful implementation is dependent on the following practices:(1)obtaining political commitment,(2)bridging knowledge gaps,and(3)sharing resources.

Implementing the Sendai Framework in Africa: Progress Against the Targets(2015–2018)

Five years after almost all African states signed the Sendai Framework for Disaster Risk Reduction 2015–2030(SFDRR), disasters still have a significant impact on the populations of Africa, their livelihoods, and the infrastructure on which they depend. In contrast with the period of the Hyogo Framework for Action 2005–2015,African countries not only adopted the SFDRR but also internalized the various priorities by developing an additional five targets applicable to the continent. This article takes a look at the progress made in Africa against the SFDRR and its seven targets thus far. To determine the progress, a mixed methods research approach was followed. The research found that African states are making progress, but decisive action is needed to reach the 2030 targets of the SFDRR. Much better data and information management are needed, and the limitations towards reaching the SFDRR targets must translate into community-based actions geared towards resilience building.