Haiti earthquake occurred in complex, active seismic region

Haiti earthquake occurred in complex, active seismic region. The magnitude 7.0 earthquake that triggered disastrous destruction and mounting death tolls in Haiti this week occurred in a highly complex tangle of tectonic faults near the intersection of the Caribbean and North American crustal plates, according to a quake expert at the Woods Hole Oceanographic Institution (WHOI) who has studied faults in the region and throughout the world.....read more...sciencedaily.com

Microorganisms cited as missing factor in climate change equation

Microorganisms cited as missing factor in climate change equation
Those seeking to understand and predict climate change can now use an additional tool to calculate carbon dioxide exchanges on land, according to a scientific journal article publishing this week.
The research, publishing in the Proceedings of the National Academy of Sciences, incorporates into global computer models the significant impact an enzyme, carbonic anhydrase, has on the chemical form of carbon dioxide released from the soil and reduces uncertainties in estimates of CO2 taken up and released in terrestrial ecosystems.

The same enzyme is present in foliage and soils, but leaves a different imprint on CO2 involved in photosynthesis and respired by soils.
"Our paper presents measurements from all the major regions of the world where we have experimentally determined the effect of this enzyme, produced by many microorganisms, on carbon dioxide released from the soil," said Dr. Behzad Mortazavi, an assistant professor of biological sciences at The University of Alabama, and a co-author of the article.
from sciencedaily.com

..read more..

Could Human CO2 Emissions Cause Another PETM? | The Resilient Earth

Could Human CO2 Emissions Cause Another PETM? | The Resilient Earth

Posted using ShareThis

Alpine glaciers in retreat.

Swiss glaciers are melting away at an accelerating rate and many will vanish this century if climate projections are correct. The Rhone glacier has been a tourist attraction since the middle of the nineteenth century.
The scenic glacier next to the road over the Furka pass retreated dramatically over the past 150 years. Pictures from 1870 show the ice reaching to the village of Gletsch in the valley. Now the ice is almost 3 km further back disappearing behind the edge
of a 450 m high ice-polished slope. A lake is forming at the foot of the shrinking Rhone glacier.

Literature:
-Panorama of the Rhone Glacier
-Swiss glaciers 'in full retreat'
-Rhône Glacier, Wikipedia
-Frozen in Memories, but Melting Before Their Eyes

Ardi sheds light on the origin of man.

A research team headed by Tim White discovered in 1992 the first Ardipithecus ramidus fossils from the Afar Depression in the Middle Awash river valley of Ethiopia. More fragments, including mainly teeth, were recovered in the following years allowing the composition of 45 percent of the total skeleton. The lines that evolved into modern humans and living apes probably shared an ancestor 6 million to 7 million years ago, in the Late Miocene. The fossils were dated as 4.4 million years of age based on its interval between the volcanic strata of the Gaala Tuff Complex and the Daam Aatu Basaltic Tuff. Studies under way indicate the species lived in the woodlands and could climb on all fours along tree branches, but the development of their arms and legs indicates they didn’t spend much time in the trees. And they could walk upright, on two legs, when on the ground. In its 2 October 2009 issue, Science presents 11 papers, authored by a diverse international team, describing the early hominid species, Ardipithecus ramidus, and its environment. These 4.4 million year old hominid fossils sit within a critical early part of human evolution, and cast new and sometimes surprising light on the evolution of human limbs and locomotion, the habitats occupied by early hominids, and the nature of our last common ancestor with chimps.

- Watch a movie by msnbc.msn.com

Literature:
- Understanding Human Origins. Light on the Origin of Man.
- World’s oldest human-linked skeleton found.
- Meet Ardipithecus Ramidus - Early Hominid Common Ancestor Was Neither Chimp Nor Human, Says Study.
- Ardipithecus ramidus - An ancestor of humans and apes?
- Ardipithecus ramidus. Hominidae species overview in Archaeologyinfo.
- Humanity Has a New 4.4 Million-Year-Old Baby Mama.

Côte Sauvage. Wild Coast of Quiberon Peninsula.

The Quiberon Peninsula was originally an island and has been joined to the mainland by the accumulation of sand washed up by the sea. Its wild scenery - particularly impressive along the Côte Sauvage on the western side - attracts many visitors. The cliffs are made up of two-mica granites. Geologists have newly interpreted the Quiberon area in the Variscan belt of South Brittany (France) as a crustal shear zone and have postulatred Carboniferous extension tectonics as evidenced by normal faults, high- and low-grade migmatites and synkinematic emplacement of the Quiberon granite pluton. Quiberon is a well-known seaside resort and has some attractive beaches on the sheltered eastern coast.
Read more about Quiberon:
- Rapid Variscan exhumation and the role of magma in core complex formation: southern Brittany metamorphic belt, France
- Armorican Massiv Geological Map
- Quiberon peninsula