The cargo ship, Indi Nurmatalia07, ran aground on 07 August, 2021 at 23.00 at ‘Cross Over’ reef in the Dorery Bay – Manokwari. The interim report revealed that the ship’s officer was not able to control the ship when it left Manokwari port due to bad weather condition when the ship left at 19.00. However, report on the cause of bad weather was doubtful because the distance between the port of Manokwari and the incident site is only about 500m. The vessel was later freed from the reef on 10 August 2021 at 19.00 after disembarking shipload. An initial quantitative assessment of damages was conducted by a local team within the grounding site. Four line transect surveys were conducted, each 25m in length and 2m in width, positioned in the left and right of the damaged and undamaged area. Our initial results demonstrated that a total area of 717,02m2 has been damaged by the cargo ship. The type of coral reef formation is patch reef with medium diversity of coral species (mainly genus Acropora, Pocillopora, Coeloseris, Millepora, and Goniopora) and coral cover. Cross over reef has a shallow reef top (between 3-10m depth), slopes down to at least 25m. The reef is subject to high velocity current that might be unsuitable for coral planula to settle permanently. Coral structures were partly crushed and fractured at the edge of the damaged area but totally damaged in central part. The central damaged site has lost remarkable bottom coral structure and diversity from at least 5 different coral genera. By using a comparison study conducted on ship groundings, the Provincial government would sue the cargo ship and insurance company to pay environmental losses due to environmental based on a calculation which considered damage in relation to the ecosystem, economy, society and ecosystem rehabilitation referring to PerMen LH No. 7/2014.

The province of West Papua in Indonesia is an area crossed by three major faults, including Sorong, Koor, and Ransiki, leading to the collision of Australia, the Pacific, and Eurasia. In the past, there have been strong and damaging earthquakes on these faults, manly Ransiki fault in the South Manokwari regency. Identification of the Ransiki fault segment was conducted by geological subsurface modeling using the earth gravity field of the Global Gravity Map (GGM) based on satellite measurements implicates for earthquake source parameters. The GGM is seen as a solution for the unavailability of direct measurements in the region. The gravity field analysis begins with data reduction using SRTM2gravity as modern terrain correction to obtain a complete Bouguer anomaly. Furthermore, the gravity gradient approach through vertical and horizontal gradients, analytical signal, and the tilt angle are applied to emphasize a contact or fault structures that are not visible using a 2D fast Fourier transform. Overall, the gravity gradient analysis obtained results that were compatible with the alignment of the Ransiki fault segment which direction of the northwest to south. The gravity inversion produces a geological subsurface model that clearly shows the Ransiki fault segment, associated with a low rock density distribution, thought to the Befoor formation and quaternary sediments, located between high-density rocks correlated to Arfak volcanic rocks as a basement.

Abstract. Tapilatu RF, Wona H, Mofu B, Kolibingso D, Alzair N, Erdmann M, Marunaya B. 2022. Foraging habitat characterization of green sea turtles, Chelonia mydas, in the Cenderawasih Bay, Papua, Indonesia: Insights from satellite tag tracking and seagrass survey. Biodiversitas 23: 2783-2789. The distribution area of green turtles is not yet known in Cenderawasih Bay. On 20 November 2020, two satellite transmitters were attached to two female green turtles (Chelonia mydas Linnaeus, 1758) on Kalilemon, Southwest Cenderawasih Bay, Papua Province, Indonesia. Kalilemon area and Mangga Island as part of Kwatisore waters are the major foraging areas for this species and are under threat of turtle opportunistic poachers. The results show that the two turtles (Mary and Nona) dispersed and used limited but consistent and different foraging grounds during the tracking period through the satellite tags between November 2020-April 2021 at Mangga Island and Kalilemon. The composition of seagrass at both stations consisted of the same five species belonging to the families Cymodoceae and Hydrocharitaceae, with relatively different qualitative abundances. Overall, the mean chlorophyll-a content during the study period from November 2020-April 2021 ranged from 0.25-0.55mg/m3 at both foraging grounds (Mangga Island and Kalilemon). The mean SST during the study period ranged from 30.61-31.77oC in both locations. Before the next tracking attempt, more data on seasonal foraging and nesting activities are required. The result of this research is vital to determine the foraging grounds for green turtles related to the seagrass species with its abundance and key environmental factors in the management and conservation of sea turtles in the Cenderawasih Bay area.

Penelitian ini dilakukan di area Pembangunan Kawasan perkantoran pemerintahan Kabupaten Manokwari Selatan, Papua Barat. Tujuan penelitian adalah untuk memperkirakan dampak perubahan tutupan lahan akibat pembangunan kawasan perkantoran terhadap debit limpasan pemukaan pada sub DAS Ransiki.             Lokasi kajian berada di sub Daerah Aliran Sungai Ransiki Kabupaten Manokwari Selatan. Kajian ini dimulai dengan pengumpulan data serta analisis data primer dan data sekunder. Data yang dikumpulkan berupa data curah hujan Manowkari Selatan, dimensi sungai dan data spatial tutupan lahan di DAS Ransiki. Data-data tersebut kemudian digunakan untuk mengetahui debit limpasan permukaan dan kapasitas tapung maksimum badan air atau sungai. Hasil yang diperoleh dari kajian menunjukan bahwa, SubDAS Ransiki memiliki debit limpasan permukaan sebesar 2.676 m3/jam, dan debit limpasan yang berasal dari kompleks perkantoran sebesar 139 m3/jam. Peningkatan debit limpasan permukaan akibat pembangunan kawasan perkantoran diperkirakan masih dapat ditampung oleh aliran sungai atau badan air terdekat.

This study aims to determine the characteristics of the Maruni Formation limestones in the Warmare area and its surroundings in Manokwari Regency by using geological mapping, and petrographic and paleontological analysis. Based on physical, petrographic and paleontological characteristics, the limestone facies in the study area consist of packstone, wackestone, mudstone and crystalline. Limestone diagenetic processes that occur in the study area are cementation diagenesis and neomorphism. Limestone depositional environment consists of two depositional environments. First, the depositional environment is in a shallow ocean shelf with limited circulation (SMF10: bioclastic packstone/wackestone with worm skeletal grains and SMF18: Grainstone or packstone with abundant foraminifera or algae; FZ7-FZ8; Platform Interior – Openmarine, Restricted). After that, sea ​​level conditions decreased, so that the depositional environment shifted towards the sea (SMF2: Micobioclastic peloidal calcisiltite and SMF3: Pelagic mudstone/wackstone – FZ3: Toe of Slope). However, in the complex classification of facies, the research area is included in the lagoon depositional environment.