2017

Seafloor topography (bathymetry) of the Pacific showing the volcanos and submerged seamounts of the Hawaiian and Emperor Chains together with the 50 million-year-old bend between them. Image: Google Earth
Published Nov. 9, 2017 9:31 AM

Hawaii sits at the end of a chain of volcanoes running across the Pacific Ocean floor, but in the middle of this chain lies a bend of 60 degrees. For many decades geoscientists have struggled to explain exactly how and why this feature occurred around 50 Million years ago. A new study in Science Advances led by postdoctoral researcher Mathew Domeier along with colleagues from the Centre for Earth Evolution and Dynamics (CEED), University of Oslo, sheds light on this long-standing geological controversy – A massive collision at the edge of the Pacific Ocean was the culprit.

Figure: Slab “vote map” at 1400 km depth overlain with position of continents at 120 Million years ago (Ma). The red-black regions show the most robust slabs (high vote count), perhaps linked to the subduction of oceans occurring at this time and blues showing the least robust (low vote count) slab locations.
Published Sep. 8, 2017 11:08 AM

Deep beneath our feet lies a vast domain that is a record of hundreds of millions of years worth of geological history. A curious image of ancient rock graveyards plunging downwards and hot rising material pushing upwards is not far from the truth. A new study by Shephard et al. published today in Scientific Reports reveals an innovative technique of creating maps that image the interior of the Earth – a ‘colour-by-numbers’ guidebook to ancient oceans that once existed at the surface, if you will.

Photo of a man on a mountain

The CEED blog covers some behind-the-scenes about our latest research and activities. The contributors are a mix of students and staff from The Centre for Earth Evolution and Dynamics, Dept. of Geosciences, University of Oslo, Norway.