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"Sumatra"
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Quaternary Palaeontology and Archaeology of Sumatra
\"The Indonesian island of Sumatra is part of a chain of islands making up Sunda and the Malay Archipelago. Sumatra is one of the largest islands in the world, housing unique and globally important tropical rainforests, a diverse array of rare plants and magnificent animals, and a population of 60 million who speak a range of Austronesian languages. As beautifully exemplified in this volume, Sumatra is a place which preserves a distinct and long-term human history, studies of which began in earnest with Eugene Dubois's explorations in the 1880s to find our ancestral 'missing link’. Archaeological investigation of megaliths and historic empires carry on to this day. A range of topics are explored here, including palaeontological study of fossil mammals and their environments, the routes that Homo erectus took during their wanderings across Indonesia, and the growth and development of societies and empires in more recent periods. This exemplary volume presents a revised view of the history of palaeontological and archaeological research as well as new ground-breaking field research, laying the foundation for future research on the biological and cultural evolution of one of the most majestic islands of the world.\" — Professor Michael Petraglia, Director of the Australian Research Centre for Human Evolution, Griffith University
eBook
Depth-varying rupture properties of subduction zone megathrust faults
Subduction zone plate boundary megathrust faults accommodate relative plate motions with spatially varying sliding behavior. The 2004 Sumatra‐Andaman (Mw 9.2), 2010 Chile (Mw 8.8), and 2011 Tohoku (Mw9.0) great earthquakes had similar depth variations in seismic wave radiation across their wide rupture zones – coherent teleseismic short‐period radiation preferentially emanated from the deeper portion of the megathrusts whereas the largest fault displacements occurred at shallower depths but produced relatively little coherent short‐period radiation. We represent these and other depth‐varying seismic characteristics with four distinct failure domains extending along the megathrust from the trench to the downdip edge of the seismogenic zone. We designate the portion of the megathrust less than 15 km below the ocean surface as domain A, the region of tsunami earthquakes. From 15 to ∼35 km deep, large earthquake displacements occur over large‐scale regions with only modest coherent short‐period radiation, in what we designate as domain B. Rupture of smaller isolated megathrust patches dominate in domain C, which extends from ∼35 to 55 km deep. These isolated patches produce bursts of coherent short‐period energy both in great ruptures and in smaller, sometimes repeating, moderate‐size events. For the 2011 Tohoku earthquake, the sites of coherent teleseismic short‐period radiation are close to areas where local strong ground motions originated. Domain D, found at depths of 30–45 km in subduction zones where relatively young oceanic lithosphere is being underthrust with shallow plate dip, is represented by the occurrence of low‐frequency earthquakes, seismic tremor, and slow slip events in a transition zone to stable sliding or ductile flow below the seismogenic zone. Key Points Seismic radiation from megathrust earthquake rupture varies with depth A 4‐domain model of radiation segmentation is introduced for megathrusts Strong‐ground motions originate from the down‐dip region
Journal Article
Trade-offs between multifunctionality and profit in tropical smallholder landscapes
Land-use transitions can enhance the livelihoods of smallholder farmers but potential economic-ecological trade-offs remain poorly understood. Here, we present an interdisciplinary study of the environmental, social and economic consequences of land-use transitions in a tropical smallholder landscape on Sumatra, Indonesia. We find widespread biodiversity-profit trade-offs resulting from land-use transitions from forest and agroforestry systems to rubber and oil palm monocultures, for 26,894 aboveground and belowground species and whole-ecosystem multidiversity. Despite variation between ecosystem functions, profit gains come at the expense of ecosystem multifunctionality, indicating far-reaching ecosystem deterioration. We identify landscape compositions that can mitigate trade-offs under optimal land-use allocation but also show that intensive monocultures always lead to higher profits. These findings suggest that, to reduce losses in biodiversity and ecosystem functioning, changes in economic incentive structures through well-designed policies are urgently needed.
Identifying economic and ecological trade-offs of land-use transitions is important to ensure sustainability. Here, Grass et al. find biodiversity-profit trade-offs in tropical land-use transitions in Sumatra, and show that targeted landscape planning is needed to increase land-use efficiency while ensuring socio-ecological sustainability.
Journal Article
The Camphor Tree and the Elephant
What is the role of religion in shaping interactions and
relations between the human and nonhuman in nature? Why are Muslim
and Christian organizations generally not a potent force in
Southeast Asian environmental movements? The Camphor Tree and
the Elephant brings these questions into the history of
ecological change in the region, centering the roles of religion
and colonialism in shaping the Anthropocene-\"the human epoch.\"
Historian Faizah Zakaria traces the conversion of the Batak
people in upland Sumatra and the Malay Peninsula to Islam and
Christianity during the long nineteenth century. She finds that the
process helped shape social structures that voided the natural
world of enchantment, ushered in a cash economy, and placed the
power to remake local landscapes into the hands of a distant elite.
Using a wide array of sources such as family histories, prayer
manuscripts, and folktales in tandem with colonial and ethnographic
archives, Zakaria brings everyday religion and its far-flung
implications into our understanding of the environmental history of
the modern world.
eBook
Prediction of Land Use and Land Cover Changes for North Sumatra, Indonesia, Using an Artificial-Neural-Network-Based Cellular Automaton
Land use and land cover (LULC) form a baseline thematic map for monitoring, resource management, and planning activities and facilitate the development of strategies to balance conservation, conflicting uses, and development pressures. In this study, changes in LULC in North Sumatra, Indonesia, are simulated and predicted using an artificial-neural-network-based cellular automaton (ANN-CA) model. Five criteria (altitude, slope, aspect, distance from the road, and soil type) are used as exploratory data in the learning process of the ANN-CA model to determine their impacts on LULC changes between 1990 and 2000; among the criteria, altitude and distance from the road have strong impacts. Comparison between the predicted and the real LULC maps for 2010 illustrates high agreement, with a Kappa index of 0.83 and a percentage of correctness of 87.28%. Then, the ANN-CA model is applied to predict LULC changes in 2050 and 2070. The LULC predictions for 2050 and 2070 demonstrate high increases in plantation area of more than 4%. Meanwhile, forest and crop area are projected to decrease by approximately 1.2% and 1.6%, respectively, by 2050. By 2070, forest and crop areas will decrease by 1.2% and 1.7%, respectively, indicating human influences on LULC changes from forest and cropland to plantations. This study illustrates that the simulation of LULC changes using the ANN-CA model can produce reliable predictions for future LULC.
Journal Article