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Fault responsible for Ishikawa quake may stretch 150 km: experts

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”Experts” have only just discovered this small detail? Been sleeping until now it seems....

-4 ( +1 / -5 )

"expert" have said something and have said-nothing.

-4 ( +0 / -4 )

The faultline was unknown until recently.

0 ( +2 / -2 )

”Experts” have only just discovered this small detail? Been sleeping until now it seems....

If you bother to look you will find quite a bit of scientific data on the faults and earthquakes around the Noto Peninsula. Because seismicity has been increasing in the last two decades it has become a focus of study.

However I can tell you from recent personal experience sometimes scientists get surprises. We had a pair of large quakes where I live a bit over a day apart back in 2019, a M6.4 quake in late morning followed by a M7.1 quake the next evening. Both quakes were highly unusual. The first quake was really three quakes and three separate faults one of which broke 90 degrees to the other two. The ground break was T shaped. That had never been seen before in recorded history. The second quake occurred across four small faults that, in the course of the quake, became one large fault. That too was something never observed before, though scientists had long theorized it was possible. It seems where we live a new branch of the San Andreas Fault is being formed that connects to the Owens Valley Fault and possibly further north along the "Walker Lane" and may be the start of a new plate boundary. Earlier Quakes in 1992 (Landers Quake) and 2002 (Hector Mine Quake) may be part of the same sequence leading to our twin quakes. We presume there will be more, perhaps on the Garlock or White Wolf Faults but who knows? We are in uncharted territory.

In the case the faults off the Noto Peninsula they are beneath the ocean and thus much more difficult to study. A previous quake in 2007 is thought to have occurred along 100 km of the fault involved, but it is not as if the ground break is easily seen. Before that 2007 quake the Noto Peninsula hadn't had a really big quake since the 1600s. Geologists learn more with every quake they study.

3 ( +4 / -1 )

Unbelievable! Not even 3 days since the disaster and they're already pointing out fault!

-1 ( +1 / -2 )

Suddenly.. how do I explain my 30 year salary working on this issue, in a country where earthquakes are frequent?

The faultline was unknown until recently.

-2 ( +0 / -2 )

At the end of its meeting in Tokyo, the panel said it believes the magnitude-7.6 quake was caused by a reverse fault, when the upper hanging wall of a fault is displaced upward away from the footwall.

Seems that this panel is looking at the result, NOT the cause of the fault activity. Yes, there is a fault but that is the result of forces amassing beneath it. I was curious why there would be such force amassing under Ishikawa as it is far from any tectonic plate interaction so did some web searches and came across an article in the Asahi Shimbun by TAKURO YAMANO/ Staff Writer on January 19, 2022.

https://www.asahi.com/ajw/articles/14515789.

So what is taking place underground?

Joint GPS monitoring by Kyoto University and Kanazawa University has shown the Earth’s crust has swollen at depths of 10-15 kilometers beneath the seismic source areas since the onset of the crustal deformation. That indicates something has gathered there in large quantities.

Nishimura said he believes that “something” is water.

A possible source of the water is the oceanic tectonic plate, which is moving from beneath the Pacific and subducting toward greater depths beneath the Japanese archipelago.

Seems that his conclusions directly align with the 10-20km depth of the earthquake activity experienced on January 1st and the aftershocks.

0 ( +0 / -0 )

From the headline:

Fault responsible for Ishikawa quake may stretch 150 km: experts

Experts say the fault was the fault.

0 ( +0 / -0 )

I live in Komaki, Aichi, and felt one strong earthquake at 16:11 h January 1st. There is more than 200 km of distance from Ishikawa region. Are volunteers being requested, needed in these areas?

0 ( +0 / -0 )

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