A structural re-evaluation of the North Banggai-Sula area, eastern Indonesia

2018 ◽  
Author(s):  
F. Ferdian
Keyword(s):  
Eastern Indonesia ◽  
The North

Held's History of Sumbawa

2017 ◽  
Author(s):  
Hans Hägerdal
Keyword(s):  
Southeast Asian ◽  
Trade Routes ◽  
Eastern Indonesia ◽  
The North ◽  
History Of ◽  
Dutch Colonialism

Sumbawa is a medium-sized island in eastern Indonesia which has a particularly interesting past. In the premodern era it lay on the trade routes that connected the north coasts of the islands of Melaka and Java with the spice-producing areas in Maluku, while Sumbawa itself exported horses, sappan wood, and rice. Its recorded history covers periods of Hindu-Javanese influence, the Southeast Asian Age of Commerce, early Islamisation, and Dutch colonialism. Dutch Indologist Gerrit Jan Held wrote this book in 1955 but died before it could be published; this volume represents its first translation into English, and includes extensive footnotes that set it in context of current research.

Source Characteristics of the 2019 Mw 6.5 Ambon, Eastern Indonesia, Earthquake Inferred from Seismic and Geodetic Data

2021 ◽  
Author(s):  
Irwan Meilano ◽  
Rino Salman ◽  
Suchi Rahmadani ◽  
Qibin Shi ◽  
Susilo Susilo ◽  
...  
Keyword(s):  
Accumulation Rate ◽  
Normal Component ◽  
Slip Rate ◽  
Velocity Fields ◽  
Geodetic Data ◽  
Capital City ◽  
Strain Rate Tensor ◽  
Source Characteristics ◽  
Eastern Indonesia ◽  
The North

Abstract The 26 September 2019 Mw 6.5 Ambon earthquake has been the largest instrumentally recorded event to occur in Ambon, the capital city of Maluku Islands, eastern Indonesia, and ruptured a previously unmapped active fault. In this study, we use seismic and geodetic data to investigate the source characteristics of the event. Our results show that the rupture process was complex in both the rupture initiation and slip directions. In addition, the rupture was mostly strike-slip motion with normal component and pure reverse slip in the north of the inverted fault. Our analysis of campaign and continuous Global Positioning System (GPS) velocity fields estimates that the fault has a 4.9 [4.0, 5.5] mm/yr slip rate with an earthquake recurrence interval of 115 [102, 141] yr. In addition, a comparison of the horizontal strain-rate tensor derived from GPS velocity fields with historical earthquake data shows that Ambon Island and the nearby regions have a high strain accumulation rate correlated with the distribution of Mw≥6 earthquakes, indicating that the regions are seismically active and possibly will experience more Ambon-type earthquakes in the future.

What Will Be Next? After a Decade of Exploration Activities Towards Giant Discovery in Indonesia

2020 ◽  
Author(s):  
J. Wiratno
Keyword(s):  
Oil And Gas ◽  
Task Force ◽  
Seismic Survey ◽  
Seismic Surveys ◽  
The Road ◽  
Eastern Indonesia ◽  
The North ◽  
Road Map ◽  
The Republic ◽  
The Government

Exploration activities in a decade we're going toward making a significant contribution to the discovery of oil and gas reserves or resources in Indonesia. The success of exploration activities is a joint result of several parties including the government and Cooperation Contract Contractors under SKK Migas control. The Special Task Force for Upstream Oil and Gas Business Activities (SKK Migas) continues to take various initiatives to find giant discoveries or significant oil and gas reserves. In the road map of exploration activities, a total of around 805 wells and 127,411 km of 2D seismic surveys and 64,513 km2 of 3D seismic surveys have been carried out to search for giant discoveries over the past decade. Exploration drilling activities were mostly carried out in the Western area of Indonesia with a total of 358 wells, followed by the Kalimantan area with planned drilling of 258 wells. Then as many as 195 wells were drilled in Java and Eastern Indonesia with 115 wells. Most seismic survey activities were carried out in eastern Indonesia with a total area surveyed along 60,928 km and an area of 25,470 km2, Kalimantan 24,475 km and an area of 15,287 km2, Java along 22,4455 km and 7,969 km2, the southern Sumatra area 6,708 km and an area of 6,708 km and 4,696 km2 and the survey in the North Sumatra and Natuna area is 12,854 km and 11,091 km2. Besides, various policies have been issued to intensify exploration activities in particular to maintain the Republic of Indonesia's National Energy Security in the eyes of the World.

Held's History of Sumbawa. An Annotated Translation

2019 ◽  
Author(s):  
Hans Hägerdal
Keyword(s):  
Southeast Asian ◽  
Trade Routes ◽  
Eastern Indonesia ◽  
The North ◽  
History Of ◽  
Annotated Translation ◽  
Dutch Colonialism

Sumbawa is a medium-sized island in eastern Indonesia which has a particularly interesting past. In the premodern era it lay on the trade routes that connected the north coasts of the islands of Melaka and Java with the spice-producing areas in Maluku, while Sumbawa itself exported horses, sappan wood, and rice. Its recorded history covers periods of Hindu-Javanese influence, the Southeast Asian Age of Commerce, early Islamisation, and Dutch colonialism. Dutch Indologist Gerrit Jan Held wrote this book in 1955 but died before it could be published; this volume represents its first translation into English, and includes extensive footnotes that set it in context of current research.

Ritual and reflexes of lost sovereignty in Sikka, a regency of Flores in eastern Indonesia

2008 ◽  
Vol 162 (2) ◽  
pp. 306-335 ◽  
Author(s):  
E.D. Lewis
Keyword(s):  
North Coast ◽  
Nation State ◽  
Eastern Indonesia ◽  
The North ◽  
The Family ◽  
The Town

In 1993 some among the Sikkanese population of the town of Maumere on the north coast of Flores in eastern Indonesia attended a ritual to reconcile the members of two branches of the family of the rajas of Sikka, a dynasty that had once ruled the district. The two branches had fallen out over differences in opinion about the last succession to the office of raja a few years before the end of the rajadom in the late 1950s. A description of the ritual, which was conducted in an urban rather than a village setting, and an analysis of the performance demonstrate much about the persistence of elements of the old Sikkanese religion in modern Sikkanese society. The contemporary Sikkanese are Christians and the regency of Sikka is part of the modern Indonesian nation-state.

scholarly journals Timor Collision Front Segmentation Reveals Potential for Great Earthquakes in the Western Outer Banda Arc, Eastern Indonesia

2021 ◽  
Vol 9 ◽  
Author(s):  
Aurélie Coudurier-Curveur ◽  
Satish C. Singh ◽  
Ian Deighton
Keyword(s):  
Active Faults ◽  
Accretionary Prism ◽  
Historical Seismicity ◽  
Normal Faults ◽  
Seismic Reflection Data ◽  
Spatially Correlated ◽  
Eastern Indonesia ◽  
The North ◽  
Reflection Data ◽  
Banda Arc

In Eastern Indonesia, the western Outer Banda arc accommodates a part of the oblique Australian margin collision with Eurasia along the Timor Trough. Yet, unlike the Wetar and Alor thrusts of the Inner Banda arc in the north and the adjacent Java subduction zone in the west, both recent and historical seismicity along the Timor Trough are extremely low. This long-term seismic quiescence questions whether the Banda Arc collision front along the Timor Trough is actually fully locked or simply aseismic and raises major concerns on the possible occurrence of large magnitude and tsunamigenic earthquakes in this vulnerable and densely populated region. Here, we jointly analyze multibeam bathymetry and 2D seismic reflection data acquired along the Timor Trough to characterize the location, nature, and geometry of active faults. Discontinuous narrow folds forming a young accretionary prism at the base of the Timor wedge and spatially correlated outcropping normal faults on the bending northwest Australian shelf reveal two concurrent contrasting styles of deformation: underthrusting and frontal accretion. We find that those tectonic regimes and their associated seismic behaviors depend on 1) the thickness of the incoming and underthrusting Cenozoic sedimentary sequence, 2) the vergence of inherited normal faults developed within the continental shelf, and 3) the depth of the décollement beneath the Timor wedge. Based on the along-strike, interchanging distinct deformation style, we identify the mechanical and seismic segmentation along the Banda arc collision front and discuss the implications for earthquake and tsunami hazards along the western Outer Banda arc region.

Held's History of Sumbawa. An Annotated Translation

2019 ◽  
Author(s):  
Hans Hägerdal
Keyword(s):  
Southeast Asian ◽  
Trade Routes ◽  
Eastern Indonesia ◽  
The North ◽  
History Of ◽  
Annotated Translation ◽  
Dutch Colonialism

Sumbawa is a medium-sized island in eastern Indonesia which has a particularly interesting past. In the premodern era it lay on the trade routes that connected the north coasts of the islands of Melaka and Java with the spice-producing areas in Maluku, while Sumbawa itself exported horses, sappan wood, and rice. Its recorded history covers periods of Hindu-Javanese influence, the Southeast Asian Age of Commerce, early Islamisation, and Dutch colonialism. Dutch Indologist Gerrit Jan Held wrote this book in 1955 but died before it could be published; this volume represents its first translation into English, and includes extensive footnotes that set it in context of current research.

Translocal Networks and Globalisation within Indonesia: Exploring the Hadhrami Diaspora from the Archipelago’s North-East

2011 ◽  
Vol 39 (2) ◽  
pp. 238-257 ◽  
Author(s):  
Martin Slama
Keyword(s):  
New Order ◽  
Eastern Indonesia ◽  
North East ◽  
The North ◽  
North Eastern ◽  
History Of ◽  
Eastern Periphery ◽  
Almost All

AbstractThis article contributes to the study of diasporic aspects of today’s Eastern Indonesia by emphasizing its long history of translocal connections, as well as the multiplicity and acceleration of contemporary flows. It focuses on the Hadhrami diaspora, i.e., Indonesians of Arabic descent whose ancestors migrated from the Hadhramaut (located in today’s Republic of Yemen) to almost all parts of the archipelago. Today, Hadhramis in north-eastern Indonesia, the region this article concentrates on, form distinct communities and maintain translocal networks. There already in colonial times, Hadhramis institutionalised their networks through an Islamic organisation called Al-Khairaat. The article investigates how the translocal networks in north-eastern Indonesia have developed, especially during the New Order and afterwards, when Hadhramis from the region increasingly incorporated Java, especially Jakarta, into their networks. Reconsidering post-Suharto transformations that are part of a globalisation within Indonesia, the article concludes that their networks connect now the north-eastern periphery and Indonesia’s centre more intensively than ever. And, as a consequence of this expansion, Hadhramis from north-eastern Indonesia were able to enter national elite circles in Jakarta.

scholarly journals Relocated aftershocks and background seismicity in eastern Indonesia shed light on the 2018 Lombok and Palu earthquake sequences

2020 ◽  
Vol 221 (3) ◽  
pp. 1845-1855 ◽  
Author(s):  
P Supendi ◽  
A D Nugraha ◽  
S Widiyantoro ◽  
J D Pesicek ◽  
C H Thurber ◽  
...  
Keyword(s):  
Double Difference ◽  
Seismic Gap ◽  
Tectonic Plates ◽  
Arrival Times ◽  
S Waves ◽  
Eastern Indonesia ◽  
The North ◽  
Initial Event ◽  
Seismicity Rates ◽  
Earthquake Sequences

SUMMARY High seismicity rates in eastern Indonesia occur due to the complex interaction of several tectonic plates which resulted in two deadly, destructive earthquake sequences that occurred in Lombok Island and the city of Palu, Sulawesi in 2018. The first sequence began in July with an Mw 6.4 event near Lombok, culminating in an Mw 7.0 event 8 d later. This was then followed by a nearby Mw 6.9 event 12 d later. Approximately 1000 km to the northeast, a separate sequence began several weeks later near Palu where an Mw 7.5 event occurred that triggered a tsunami. In this study, we present hypocentre relocations for both earthquake sequences as well as all other regional earthquakes in eastern Indonesia. The relocations were performed using a teleseismic double-difference relocation method and arrival times for P and S waves from stations at local, regional, and teleseismic distances. The catalogue and phase data were taken from the Agency for Meteorology, Climatology and Geophysics (BMKG) of Indonesia and the International Seismological Centre (ISC) for the period of April 2009 through November 2018. The relocated catalogue provides an improved view of seismicity in eastern Indonesia over the study period, sharpening locations and interpretations of seismogenic features throughout the region. In the Lombok area, the relocated earthquakes clearly show a backarc thrust to the north of the Sunda-Banda Arc transition zone. The relocated aftershocks show that the destructive Mw 7.0 and Mw 6.9 earthquakes of the Lombok sequence ruptured two different regions: The Mw 7.0 earthquake propagated westward, whereas the Mw 6.9 earthquake propagated eastward. The entire sequence of Lombok earthquakes was most likely started by the Mw 6.4 event as the initial event or foreshock, which then triggered backarc thrusts on both sides. Several weeks later and far to the northeast, the Mw 7.5 Palu earthquake occurred along the Palu-Koro Fault, filling a seismic gap that had not ruptured in an Mw 6.0 event or larger since at least 1900. The distribution of aftershocks indicates that the northern part of the Palu-Koro Fault has lower relative seismicity rates than the southern part at shallow depths, and that off fault aftershocks are mostly located to the east of the Palu-Koro Fault.

scholarly journals Early Results of Eastern Indonesia P-wave Tomography Study Using Regional Events

2021 ◽  
Vol 873 (1) ◽  
pp. 012068
Author(s):  
M I Sulaiman ◽  
P A Subakti ◽  
Haolia ◽  
D Y Fatimah ◽  
I Madrinovella ◽  
...  
Keyword(s):  
P Wave ◽  
S Wave ◽  
Low Velocity ◽  
Seismicity Pattern ◽  
Velocity Anomaly ◽  
Eastern Indonesia ◽  
The North ◽  
Early Results ◽  
Slab Tear ◽  
Tectonic System

Abstract The tectonic system of Eastern Indonesia is controlled by several major and minor plates, such as Indo-Australian, Australian plate, and Pacific plates. This area is known for its complexity, and high seismic activity. This study tries to image the complex structures beneath this region by employing regional events data and seismic tomography methods. We used five years of regional events catalog provided by the Indonesian Agency of Meteorology, Climatology, and Geophysics. We have sorted 7336 events recorded between 120° – 136° longitude and 0° – 13°(-) latitude consisting of 46446 P and 15467 S wave arrival data. Relocated hypocenter map shows a better constrain location on seismicity along outer Bandar Arc. A dipping pattern of seismicity is seen that is going deeper to the Banda Sea. The seismicity map also images a steep angle pattern of seismicity that could be related to the subduction slab roll-back model at North of Wetar island. Interestingly, we spotted a seismicity gap in West Seram that could be linked with slab tear zone. The checker-board test suggests a proper resolution is still reliable to a depth of 200 km with a less interpretable model at a depth of 300 km. P-wave tomographic models image the high velocity dipping down going slab. The Banda slab is seen to subduct from south Timor Island to the north, from east Tanimbar and Aru Island to west part, and from north Seram Island to south. We observed the down-going slab meet from all directions at about 300 km beneath the Banda sea. P wave tomogram also shows the Timor Island slab has a steeper dip that agrees with the seismicity pattern. Near the Seram island, we identify a low-velocity anomaly zone infiltrate the Banda slab beneath the shallow part of West Seram, which was previously interpreted as slab tear zone. This study also noticed a higher velocity tomogram model at North of Wetar island that might indicate a back-arc thrust. Lastly, a low-velocity band is also exposed at a shallow depth close to the volcano chain along that Banda volcanic arc.

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