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The Structure of the Oceanic Crust o...

Nakrong, Nipaporn.

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The Structure of the Oceanic Crust on the Northeast Hawaiian Arch Imaged by Pre-Stack Depth Migration of Active-Source Seismic Data.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The Structure of the Oceanic Crust on the Northeast Hawaiian Arch Imaged by Pre-Stack Depth Migration of Active-Source Seismic Data./
Author:	Nakrong, Nipaporn.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	58 p.
Notes:	Source: Masters Abstracts International, Volume: 81-03.
Contained By:	Masters Abstracts International81-03.
Subject:	Geophysics. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13881508
ISBN:	9781085635141

The Structure of the Oceanic Crust on the Northeast Hawaiian Arch Imaged by Pre-Stack Depth Migration of Active-Source Seismic Data.
Nakrong, Nipaporn.

The Structure of the Oceanic Crust on the Northeast Hawaiian Arch Imaged by Pre-Stack Depth Migration of Active-Source Seismic Data. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 58 p.

Source: Masters Abstracts International, Volume: 81-03.

Thesis (M.S.)--University of Hawai'i at Manoa, 2019.

This item is not available from ProQuest Dissertations & Theses.

The Northeast Hawaiian Arch off O'ahu, formed by flexure of the Pacific Plate under the load of the Hawaiian volcanic island chain, is one of the regions under consideration for Integrated Ocean Drilling Program (IODP) drilling through the oceanic crust to the Mohorovicic discontinuity (Moho). Modern geophysical surveys in this area, including wide-angle seismic refraction data and multi-channel seismic reflection data (MCS), are insufficient for imaging the oceanic crustal structure and the Moho characteristics in order to define the potential drilling site. Therefore, the Japan Agency for Marine-Earth Science and Technology (JAMSTEC) carried out an active source 2-D seismic survey along the Hawaiian Arch using R/V Kairei in August and September 2017. One 750-km-long E-W reflection profile, shot perpendicular to abyssal hill (spreading) fabric, passes over five ocean bottom seismometers (OBS) with 150-km interval; three shorter N-S profiles were shot perpendicular to the long line at the OBS locations. We conducted pre-stack depth migration (PSDM) in an attempt to better image the Moho reflections than is possible with post-stack migration. The PSDM images confirm that the crustal thickness is approximately 5.4 km with a standard deviation of 0.3 km. Moho reflection is identified 50% of all lines, including shingled Moho (5%) and diffusive Moho (45%). Lower crustal dipping reflections (LCDRs) found at the east edge of Line E-W dip 5o to 12o toward the paleo-ridge axis and terminate at the Moho. These LCDRs may originate from a secondary shear zone due to active magma upwelling at the time of crustal accretion. We found the thick MTZs (>100m), imaged as the diffusive Moho, commonly accompanied by sub-Moho events.

ISBN: 9781085635141Subjects--Topical Terms:

535228
Geophysics.
Subjects--Index Terms:

Lower Crustal Dipping Reflection

The Structure of the Oceanic Crust on the Northeast Hawaiian Arch Imaged by Pre-Stack Depth Migration of Active-Source Seismic Data.
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245 1 4 $a The Structure of the Oceanic Crust on the Northeast Hawaiian Arch Imaged by Pre-Stack Depth Migration of Active-Source Seismic Data.
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500 $a Source: Masters Abstracts International, Volume: 81-03.
500 $a Includes supplementary digital materials.
500 $a Advisor: Moore, Gregory F.
502 $a Thesis (M.S.)--University of Hawai'i at Manoa, 2019.
506 $a This item is not available from ProQuest Dissertations & Theses.
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506 $a This item must not be added to any third party search indexes.
520 $a The Northeast Hawaiian Arch off O'ahu, formed by flexure of the Pacific Plate under the load of the Hawaiian volcanic island chain, is one of the regions under consideration for Integrated Ocean Drilling Program (IODP) drilling through the oceanic crust to the Mohorovicic discontinuity (Moho). Modern geophysical surveys in this area, including wide-angle seismic refraction data and multi-channel seismic reflection data (MCS), are insufficient for imaging the oceanic crustal structure and the Moho characteristics in order to define the potential drilling site. Therefore, the Japan Agency for Marine-Earth Science and Technology (JAMSTEC) carried out an active source 2-D seismic survey along the Hawaiian Arch using R/V Kairei in August and September 2017. One 750-km-long E-W reflection profile, shot perpendicular to abyssal hill (spreading) fabric, passes over five ocean bottom seismometers (OBS) with 150-km interval; three shorter N-S profiles were shot perpendicular to the long line at the OBS locations. We conducted pre-stack depth migration (PSDM) in an attempt to better image the Moho reflections than is possible with post-stack migration. The PSDM images confirm that the crustal thickness is approximately 5.4 km with a standard deviation of 0.3 km. Moho reflection is identified 50% of all lines, including shingled Moho (5%) and diffusive Moho (45%). Lower crustal dipping reflections (LCDRs) found at the east edge of Line E-W dip 5o to 12o toward the paleo-ridge axis and terminate at the Moho. These LCDRs may originate from a secondary shear zone due to active magma upwelling at the time of crustal accretion. We found the thick MTZs (>100m), imaged as the diffusive Moho, commonly accompanied by sub-Moho events.
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650 4 $a Petrology. $3 535210
653 $a Lower Crustal Dipping Reflection
653 $a Mohorovicic Discontinuity
653 $a NE Hawaiian Arch
653 $a Oceanic Crustal Thickness
653 $a Pre-Stack Depth Migration
653 $a Sub-Moho Event
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710 2 $a University of Hawai'i at Manoa. $b Geology and Geophysics. $3 2106121
773 0 $t Masters Abstracts International $g 81-03.
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