4th moderate earthquake near Lake Toba supervolcano in 7 days

June 18, 2011 – A 12 km deep, 4.9 magnitude earthquake (the third in a week) has been reported just south of the Lake Toba caldera seen on the USGS map above. The fourth quake was a 4.7 at a depth of 47 km, north of the super-volcano caldera. According to geologists, the Toba super eruption occurred between 69,000 and 77,000 years ago at Lake Toba (Northern Sumatra, Indonesia) and it is recognized as one of the Earth’s largest known eruptions. The related catastrophe theory holds that this super-volcanic event plunged the planet into a 6-to-10-year volcanic winter, which resulted in the world’s human population being reduced to 10,000 or even a mere 1,000 breeding pairs, creating a bottleneck in human evolution. Some researchers argue that the Toba eruption produced not only a catastrophic volcanic winter but also an additional 1,000-year cooling episode. –Wikipedia