Sunday, September 25, 2011

El Hierro Canary Island Earthquake Tremors Alert

The earthquake activity has increased below the smallest of the volcanic Canary Islands, El Hierro. Volcanic Risk Alert has been increased to yellow - see: Earthquake Report

A new series of tremors under El Hierro have increased in magnitude over the last few days.

2011-09-25 27.70°N 18.08°W Depth14 Mag2.8 El Hierro (Canary Islands)
2011-09-24 27.69°N 18.07°W Depth14 Mag3.1 El Hierro (Canary Islands)
2011-09-24 27.70°N 18.08°W Depth14 Mag3.3 El Hierro (Canary Islands)
2011-09-23 27.77°N 18.09°W Depth16 Mag2.5 El Hierro (Canary Islands)
2011-09-23 27.71°N 18.03°W Depth19 Mag2.9 El Hierro (Canary Islands)
2011-09-23 27.68°N 18.05°W Depth11 Mag2.5 El Hierro (Canary Islands)
2011-09-23 27.68°N 18.06°W Depth12 Mag2.7 El Hierro (Canary Islands)
2011-09-22 27.67°N 18.04°W Depth14 Mag2.8 El Hierro (Canary Islands)

El Hierro has the largest number of volcanoes in the Canary Island chain. Scientists suggest that the Island has experienced at least three volcanic landslide collapses, creating tsunami or mega tsunami waves.

I discovered interesting information about tsunami's in the Atlantic...

Tsunami Warning
Islands of volcanic origin, such as the Canaries, have an especially large potential for triggering a tsunami. That the Canaries constitute a danger was shown 300 000 years ago when a part of the island El Hierro slid into the sea, triggering a mega-tsunami which carried rocks as high as a house for many hundreds of metres into the interior of the east coast of what is today the USA. The danger of a similar island collapse is seen by scientists particularly at the island of La Palma in the Canaries. Here, following a volcanic eruption in 1949 almost half of the mountain range of 20 km moved westwards towards the sea, leaving a large tear in the volcanic basalt. In the event of a fresh eruption, a huge part of the volcano could loosen itself due to differences in the types of rock and diverse water deposits within the now active volcano. As a result, the densely populated east coast of America would be massively threatened. According to a computer simulation by Stephen N. Ward and Simon Day, a tsunami (purple-red on the graphics) would rush across the Atlantic if the slopes of the Cumbre Vieja.volcano were to collapse into the sea.