scholarly journals Far-field simulation of tsunami propagation in the Pacific Ocean: Impact on the Marquesas Islands (French Polynesia)

2001 ◽  
Vol 106 (C5) ◽  
pp. 9161-9177 ◽  
Author(s):  
Hélène Hébert ◽  
Philippe Heinrich ◽  
François Schindelé ◽  
Alessio Piatanesi
Keyword(s):  
Pacific Ocean ◽  
French Polynesia ◽  
Far Field ◽  
Tsunami Propagation ◽  
Marquesas Islands ◽  
Field Simulation ◽  
The Pacific ◽  
The Pacific Ocean

New sciaphilic plakinids (Porifera, Homoscleromorpha) from the Central-Western Pacific

Zootaxa ◽  
2018 ◽  
Vol 4466 (1) ◽  
pp. 8 ◽  
Author(s):  
ANAÍRA LAGE ◽  
GUILHERME MURICY ◽  
CÉSAR RUIZ ◽  
THIERRY PÉREZ
Keyword(s):  
New Species ◽  
Pacific Ocean ◽  
Evolutionary Biology ◽  
New Caledonia ◽  
Western Pacific ◽  
Marquesas Islands ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Submarine Caves

The sponge class Homoscleromorpha is a key model for the evolutionary biology of the Metazoa but its diversity remains poorly known. Here we describe six new species of the homoscleromorph family Plakinidae found in shaded habitats (submarine caves, tunnels and overhangs) of New Caledonia and Marquesas Islands, Central-Western Pacific. The new species belong to four genera: Corticium (Corticium vaceleti sp. nov.), Plakina (Plakina finispinata sp. nov.), Plakinastrella (Plakinastrella osculifera sp. nov., Plakinastrella nicoleae sp. nov. and Plakinastrella pseudolopha sp. nov.), and Plakortis (Plakortis ruetzleri sp. nov.). Plakinastrella pseudolopha sp. nov. has a novel spicule type called here ‘pseudolophose spicules’. The diversity of Homoscleromorpha is raised to 50 species in the Pacific Ocean and 120 spp. worldwide. 

scholarly journals A root for massive crown-of-thorns starfish outbreaks in the Pacific Ocean

2021 ◽  
Author(s):  
Nina Yasuda ◽  
June Inoue ◽  
Michael R. Hall ◽  
Manoj R. Nair ◽  
Mehdi Adjeroud ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Environmental Changes ◽  
French Polynesia ◽  
The Philippines ◽  
Marshall Islands ◽  
Western Pacific ◽  
Central Pacific ◽  
The Pacific ◽  
The Pacific Ocean ◽  
The Western Pacific

AbstractRecurring outbreaks of crown-of-thorns starfish (COTS) severely damage healthy corals in the Western Pacific Ocean. To determine the source of outbreaking COTS larvae and their dispersal routes across the Western Pacific, complete mitochondrial genomes were sequenced from 243 individuals collected in 11 reef regions. Our results indicate that Pacific COTS comprise two major clades, an East-Central Pacific clade (ECP-C) and a Pan-Pacific clade (PP-C). The ECP-C consists of COTS from French Polynesia (FP), Fiji, Vanuatu and the Great Barrier Reef (GBR), and does not appear prone to outbreaks. In contrast, the PP-C, which repeatedly spawns outbreaks, is a large clade comprising COTS from FP, Fiji, Vanuatu, GBR, Papua New Guinea, Vietnam, the Philippines, Japan, Micronesia, and the Marshall Islands. Given the nature of Pacific Ocean currents, the vast area encompassing FP, Fiji, Vanuatu, and the GBR likely supplies larvae for repeated outbreaks, exacerbated by anthropogenic environmental changes, such as eutrophication.

scholarly journals Tsunami risk assessment in the Marquesas Islands (French Polynesia) through numerical modeling of generic far-field events

2001 ◽  
Vol 1 (4) ◽  
pp. 233-242 ◽  
Author(s):  
H. Hébert ◽  
F. Schindelé ◽  
P. Heinrich
Keyword(s):  
Numerical Modeling ◽  
Subduction Zones ◽  
Seismic Energy ◽  
French Polynesia ◽  
Pacific Rim ◽  
Far Field ◽  
Tsunami Waves ◽  
Marquesas Islands ◽  
The Pacific ◽  
Run Up

Abstract. Earthquakes occurring at the Pacific Rim can trigger tsunamis that propagate across the ocean and can produce significant damages far away from the source. In French Polynesia, the Marquesas Islands are the most exposed to the far-field tsunami hazards, since they are not protected by any outer coral reef and since submarine slopes are less steep than in other islands. Between 1994 and 1996, four tsunamis have reached the bays of the archipelago, among them, the tsunami initiated by the Chilean Mw 8.1 earthquake, produced up to 3 m high waves in Tahauku Bay. Numerical modeling of these recent events has already allowed us to validate our method of resolution of hydrodynamics laws through a finite-difference scheme that simulates the propagation of the tsunamis across the ocean and computes the inundation heights (run-up) in remote bays. We present in this paper the simulations carried out to study potentially threatening areas located at the Pacific Rim, on the seismogenic Aleutian and Tonga subduction zones. We use a constant seismic moment source (that of the Mw 8.1 Chile 1995 earthquake, M0 = 1.2 1021 N.m) located at several potential epicenters, with the fault strike adapted from the regional seismotectonics pattern. Our results show that the sources chosen in the Aleutian trench do not produce large inundations in the Marquesas bays, except for the easternmost source (longitude 194° E). Sources located in the Tonga trench do not produce high amplifications either, except for the northernmost one (latitude 16° S). We also discuss the behaviour of the tsunami waves within the archipelago, and evidence contrasting responses depending on the arrival azimuths. These results show that, for a given initial seismic energy, the tsunami amplification in remote bays is highly dependent on the source location and fault strike.

scholarly journals Draft Genome Sequence of “Candidatus Moanabacter tarae,” Representing a Novel Marine Verrucomicrobial Lineage

2018 ◽  
Vol 7 (15) ◽  
Author(s):  
Julian Vosseberg ◽  
Joran Martijn ◽  
Thijs J. G. Ettema
Keyword(s):  
Pacific Ocean ◽  
Genome Sequence ◽  
Environmental Samples ◽  
Draft Genome ◽  
Draft Genome Sequence ◽  
Marquesas Islands ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Marine Environmental

The Tara Oceans Consortium has published various metagenomes of marine environmental samples. Here, we report a contig of 2.6 Mbp from the assembly of a sample collected near the Marquesas Islands in the Pacific Ocean, covering a nearly complete novel verrucomicrobial genome.

scholarly journals TSUNAMI PROPAGATION IN THE PACIFIC OCEAN

1976 ◽  
Vol 1 (15) ◽  
pp. 57
Author(s):  
Manfred Engel ◽  
Wilfried Zahel
Keyword(s):  
Pacific Ocean ◽  
Eddy Viscosity ◽  
Sea Surface ◽  
Tsunami Propagation ◽  
Surface Time ◽  
The Pacific ◽  
Wave Travel ◽  
The Pacific Ocean ◽  
Distance Propagation ◽  
Water Elevation

The Alaska tsunami of March 28, 1964, caused by a tectonic uplift, propagated across the Pacific Ocean and was even recorded at the shores of New Zealand and the Antarctica. The large distance propagation of this tsunami is investigated by a numerical model based on the shallow water equations. The model includes bottom friction, eddy viscosity and Coriolis acceleration and yields the water elevation and the vertically integrated current velocity. The generation mechanism is given by a simplified initial condition, that is derived from the observed average uplift of 1.8 m for an area of 110000 km on the Continental Shelf. The computed tsunami propagation is presented by means of the first wave travel time and height on Pacific Ocean maps and by giving sea surface time series for selected stations. These computed results are compared with observations, especially considering the limitations of the model due to the coarse grid net having been used.

New records of deep-sea spider crabs of the genus Cyrtomaia Miers, 1886, from the Pacific Ocean, with description of a new species (Crustacea: Decapoda: Brachyura: Majidae)

Zootaxa ◽  
2008 ◽  
Vol 1861 (1) ◽  
pp. 17
Author(s):  
BERTRAND RICHER DE FORGES ◽  
PETER K. L. NG
Keyword(s):  
New Species ◽  
Pacific Ocean ◽  
Deep Sea ◽  
New Records ◽  
French Polynesia ◽  
South Pacific Ocean ◽  
The Pacific ◽  
Sea Spider ◽  
The Pacific Ocean ◽  
A New Species

Recent collections of deep-sea majid crabs from the South Pacific Ocean and Taiwan provide new records of five species of Cyrtomaia Miers, 1886, and a new species from French Polynesia, C. polynesica n. sp. The news species is most similar to the recently described C. micronesica Richer de Forges & Ng, 2007, but differs from this species in the morphology of its carapace and pereopods.

On the Pacific Ocean regime shift

2001 ◽  
Vol 28 (19) ◽  
pp. 3721-3724
Author(s):  
Cathy Stephens
Keyword(s):  
Pacific Ocean ◽  
Regime Shift ◽  
The Pacific ◽  
The Pacific Ocean
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