Reference Article

from Wikipedia, the free encyclopedia

Toba catastrophe theory

According to the Toba catastrophe theory, modern human evolution was affected by a recent, large volcanic event.

Within the last three to five million years, after human and other ape lineages diverged from the hominid stem-line, the human line produced a variety of human species.

According to the Toba catastrophe theory, a massive volcanic eruption changed the course of human history by severely reducing the human population.

This may have occurred when around 70–75,000 years ago the Toba caldera in Indonesia underwent a category 8 or "mega-colossal" eruption on the Volcanic Explosivity Index.

This may have reduced the average global temperature by 3 to 3.5 degrees Celsius for several years and may possibly have triggered an ice age.

This massive environmental change is believed to have created population bottlenecks in the various species that existed at the time; this in turn accelerated differentiation of the isolated human populations, eventually leading to the extinction of all the other human species except for the branch that became modern humans.

Note: This article excerpts material from the Wikipedia article "Toba catastrophe theory", which is released under the GNU Free Documentation License.

See the following related content on ScienceDaily:


Related Videos

last updated on 2014-11-23 at 4:50 am EST

Precious Collection of Treasure Debuts in Rome

Precious Collection of Treasure Debuts in Rome

Reuters (Oct. 30, 2013) The "Treasure of San Gennaro", an Italian treasure trove of gifts to ward off catastrophe, goes on show in Rome. Tara Cleary reports.
Powered by NewsLook.com
How A Nuclear Bomb Nearly Detonated Over N.C. In 1961

How A Nuclear Bomb Nearly Detonated Over N.C. In 1961

Newsy (June 12, 2014) According to newly declassified documents, North Carolina nearly faced catastrophe in 1961 when an armed nuclear bomb fell near Goldsboro. Video provided by Newsy
Powered by NewsLook.com
Researchers Purpose New Origin of Stonehenge

Researchers Purpose New Origin of Stonehenge

Newsy (Mar. 9, 2013) A new theory suggests Stonehenge was created as a huge graveyard for the elite.
Powered by NewsLook.com
Stonehenge Experts Have Been Digging in the Wrong Place

Stonehenge Experts Have Been Digging in the Wrong Place

Newsy (Nov. 22, 2013) Until now, it was believed the 11 bluestones came from one of the Preseli Hills in Pembrokeshire. But turns out, that theory was about two miles off.
Powered by NewsLook.com

Related Stories


Share This



Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins