In the summer of 2010 Earth Scientific Research Institute (ESRI) published a paper on the impact of Earth spin speed change. ESRI have also shared a simulator of changed shore lines as a result of slower spin speeds. More on ESRI site
Earlier on and in December 2009 I published my book on Earth Changes. At such time I introduced a new proposal to explain what makes Earth to spin about its axis and why it could speed up and slow down its spin. More you may find on the page titled Earth Spin on this site. I also explained that a different spin speed will certainly change the Sea Level and Earth geography as we currently now it, and could explain why there are many cities submerged by sea at the Mediterranean basin due to successive increase of sea level over the last 3 Change Cycles; each lasting 3,562 years and each having different spin speed.