2018
DOI: 10.5918/jamstecr.26.54
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The OJP array: seismological and electromagnetic observation on seafloor and islands in the Ontong Java Plateau

Abstract: We conducted geophysical observations on the Ontong Java Plateau (OJP) and its vicinity from late 2014 to early 2017 to determine the underlying crust and upper mantle structure beneath the OJP. Most of the OJP was emplaced in the present South Pacific region at 122 Ma by massive volcanism, but the origin of this volcanism are still debated. Previous studies have suggested that seismic velocity beneath the OJP is anomalously slow, thus this could represent thermal or chemical remnants of the volcanism. However… Show more

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Cited by 12 publications
(8 citation statements)
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“…A temporary seismological network “OJP array” was deployed in the OJP and its vicinity from late 2014 to early 2017 26 (Fig. 1 ).…”
Section: Methodsmentioning
confidence: 99%
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“…A temporary seismological network “OJP array” was deployed in the OJP and its vicinity from late 2014 to early 2017 26 (Fig. 1 ).…”
Section: Methodsmentioning
confidence: 99%
“…Therefore, it has not been possible to discuss the relation between the surface tectonics and the deep structure. In this study, we developed a novel three-dimensional (3D) P-wave velocity structure by using data from a seismological experiment deployed in and around the OJP from late 2014 to early 2017 26 and we succeeded in resolving the P-wave velocity structure in the upper mantle including the mantle transition zone. Through the results of this study, we illustrate the extended high-velocity anomalies in the mantle transition zone beneath the OJP and the sheet-like low velocity anomalies along the Caroline Islands, and discuss their relation and impacts on the surface tectonics.…”
Section: Introductionmentioning
confidence: 99%
“…In choosing when or how to apply a resonance removal filter, a systematic approach to facilitate the detection of the signature and strength of reverberations is needed, so as to ensure more confident and robust signal enhancement. Such an approach should have the ability to handle the complexities and challenges faced when the seismic structure of the reverberant layer varies in a complicated fashion across the array (Barcheck et al, 2020;Laske et al, 2009;Suetsugu et al, 2018). In the most challenging case where reverberations from multiple layers are expressed, i.e., water column, sediments in the oceans, ice sheets and sediments in the polar regions, the existing signal processing methods may fail to disentangle the signature of reverberations due to the complicated nature of the spectra.…”
Section: Introductionmentioning
confidence: 99%
“…From December 2014 to January 2017, a geophysical network was deployed around the Ontong Java Plateau (OJP). This network, the OJP array, includes 23 broadband ocean bottom seismometers (BBOBSs) together with broadband seismic stations at two nearby islands and is designed to reveal the seismic structure of the Plateau (Suetsugu et al, 2018). During the process of conducting the Rayleigh wave dispersion analysis for regional tomography (Kawano et al, 2019), we noticed, in NCFs, the presence of band‐limited signals whose apparent travel time is smaller than that of interstation Rayleigh waves, suggesting the existence of persistent spatially localized signal sources.…”
Section: Introductionmentioning
confidence: 99%