@article {Hirano1999,
	title = {{Temporal changes of cracks in the oceanward slope of northern Japan Trench off Sanriku: Six-year observation by submersibles}},
	journal = {JAMSTEC Journal of Deep Sea Research},
	number = {14},
	year = {1999},
	pages = {445{\textendash}454},
	issn = {1340-7848},
	url = {http://docsrv.godac.jp/MSV2{\_}DATA/23/14{\_}36.pdf},
	author = {Hirano, S and Ogawa, Y and Yujiro, F and Fujioka, K and Kawamura, K}
}
@article {Ogawa1998,
	title = {{Preservation of biogenic opal-A in earliest Cretaceous radiolarian claystone from the western Pacific}},
	journal = {Journal of Sedimentary Research, Section A: Sedimentary Petrology and Processes},
	volume = {68},
	number = {3},
	year = {1998},
	pages = {435{\textendash}439},
	issn = {1073-130X},
	url = {http://jsedres.geoscienceworld.org/cgi/content/abstract/68/3/435},
	author = {Ogawa, Y and Kawata, T}
}
