Thursday, 4 August 2016

M6.1 - 48km WSW of La Quiaca, Argentina is the second major quake of August


USGS

A magnitude 6.1 - 48km WSW of La Quiaca, Argentina is the second major quake of August.
Green alert for shaking-related fatalities and economic losses.
There is a low likelihood of casualties and damage.
Structure Information Summary Overall, the population in this region resides in structures that are vulnerable to earthquake shaking, though some resistant structures exist.
It is the 81st quake of 2016!

Are we experiencing an uptick in major quakes this year?
We have reached the half way point of 2016 and we have had a total of 72 major quakes, that is an earthquake of magnitude 6. or more.
42 is a steady average, 2015 had recorded 74 at this stage of the year and went on to record 146 for the year which is also average for the 21st century.
2014 had slightly more at this stage of the year with 84 but finished the year on 155.
Incidentally, I record every major quake on this blog and I had the yearly total at 82 major quakes, so it would be safe to say USGS have downgraded at least 10 quakes which were originally recorded at mag 6. or higher.
Below is a breakdown of major quakes since 2000




I receive many comments on The Big Wobble claiming major quakes are on the rise.
Since the year 2000 major quakes have remained quite consistent in numbers.
I have broken down all major quakes since the 2000 and put each category onto the same graph, (see above)
Apart from 2007 which recorded 196 major quakes and 2011 which recorded a record 207 major quakes, 81 of these being in the Japan area, the chart is remarkably similar.
The biggest quake to rock the earth was a mag 9.1 off the west coast of northern Sumatra, Indonesia. This was the third largest earthquake in the world since 1900 and is the largest since the 1964 Prince William Sound, Alaska earthquake.
In total, 227,898 people were killed or were missing and presumed dead and about 1.7 million people were displaced by the earthquake and subsequent tsunami in 14 countries in South Asia and East Africa.
The only other mag 9.0 earthquake in this time period was the 2011 quake near the east coast of Honshu, Japan.
At least 15,703 people killed, 4,647 missing, 5,314 injured, 130,927 displaced and at least 332,395 buildings, 2,126 roads, 56 bridges and 26 railways destroyed or damaged by the earthquake and tsunami along the entire east coast of Honshu from Chiba to Aomori.
The majority of casualties and damage occurred in Iwate, Miyagi and Fukushima from a Pacific-wide tsunami with a maximum runup height of 37.88 m at Miyako.
The total economic loss in Japan was estimated at 309 billion US dollars. Electricity, gas and water supplies, telecommunications and railway service disrupted and several reactors severely damaged at a nuclear power plant near Okuma.
Several fires occurred in Chiba and Miyagi. At least 1,800 houses destroyed when a dam failed in Fukushima.
The Fukushima nuclear plant is still trying to stop nuclear material leaking into the sea and atmosphere five years after the disaster. 

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