@article {6237, title = {Post-Glacial Flooding of the Bering Land Bridge Dated to 11 cal ka BP Based on New Geophysical and Sediment records}, volume = {13}, year = {2017}, month = {August 1}, pages = {991-1005}, publisher = {Copernicus Publications}, abstract = {
The Bering Strait connects the Arctic and Pacific oceans and separates the North American and Asian landmasses. The presently shallow ( 53 m) strait was exposed during the sea level lowstand of the last glacial period, which permitted human migration across a land bridge today referred to as the Bering Land Bridge. Proxy studies (stable isotope composition of foraminifera, whale migration into the Arctic Ocean, mollusc and insect fossils and paleobotanical data) have suggested a range of ages for the Bering Strait reopening, mainly falling within the Younger Dryas stadial (12.9\–11.7 cal ka BP). Here we provide new information on the deglacial and post-glacial evolution of the Arctic\–Pacific connection through the Bering Strait based on analyses of geological and geophysical data from Herald Canyon, located north of the Bering Strait on the Chukchi Sea shelf region in the western Arctic Ocean. Our results suggest an initial opening at about 11 cal ka BP in the earliest Holocene, which is later than in several previous studies. Our key evidence is based on a well-dated core from Herald Canyon, in which a shift from a near-shore environment to a Pacific-influenced open marine setting at around 11 cal ka BP is observed. The shift corresponds to meltwater pulse 1b (MWP1b) and is interpreted to signify relatively rapid breaching of the Bering Strait and the submergence of the large Bering Land Bridge. Although the precise rates of sea level rise cannot be quantified, our new results suggest that the late deglacial sea level rise was rapid and occurred after the end of the Younger Dryas stadial.
}, doi = {doi.org/10.5194/cp-13-991-2017}, url = {https://www.clim-past.net/13/991/2017/cp-13-991-2017.pdf}, author = {Martin Jakobsson and Pearce, Christof and Cronin, Tomas and Backman, Jan and Anderson, Louise and Barrientos, Natalia and Bjork, G and Helen K. Coxall and de Boer, A. and Larry A Mayer and M{\"o}rth, C-M. and Johan Nilsson and Rattray, J.E. and Christian Stranne and Semiltov, I. and O{\textquoteright}Regan, M A} } @article {5172, title = {Stress State in the Largest Displacement Area of the 2011 Tohoku-Oki Earthquake}, volume = {339}, number = {6120}, year = {2013}, month = {2013}, pages = {687{\textendash}690}, abstract = {The 2011 moment magnitude 9.0 Tohoku-Oki earthquake produced a maximum coseismic slip of more than 50 meters near the Japan trench, which could result in a completely reduced stress state in the region. We tested this hypothesis by determining the in situ stress state of the frontal prism from boreholes drilled by the Integrated Ocean Drilling Program approximately 1 year after the earthquake and by inferring the pre-earthquake stress state. On the basis of the horizontal stress orientations and magnitudes estimated from borehole breakouts and the increase in coseismic displacement during propagation of the rupture to the trench axis, in situ horizontal stress decreased during the earthquake. The stress change suggests an active slip of the frontal plate interface, which is consistent with coseismic fault weakening and a nearly total stress drop.
}, author = {Lin, Weiren and Conin, Marianne and Moore, J Casey and Chester, Frederick M and Nakamura, Yasuyuki and James J Mori and Anderson, Louise and Brodsky, Emily E and Eguchi, Nobuhisa and Cook, Becky and Jeppson, Tamara and Monica L Wolfson-Schwehr and others} }