Is this Ammo Slide New?

[ChrisB]

I took a ride up cog base road last month and noticed a diagonal slide I don't remember seeing before.

Is this a recent occurrence?



Note: This photo is from the NEClimbs web site

 

[HH1]

This slide shows on a winter image on Fatmap, at about 4K feet just south of the Cog, so it's not recent.

https://fatmap.com/adventures/@44.2704218,-71.3208757,501.1996137,-88.3092055,0,1257.4055633,normal

 

[JoshandBaron]

This slide shows on a winter image on Fatmap, at about 4K feet just south of the Cog, so it's not recent.

https://fatmap.com/adventures/@44.2704218,-71.3208757,501.1996137,-88.3092055,0,1257.4055633,normal

It doesn't show on the summer image. Recent is relative, any idea when it came down?

 

[ChrisB]

It doesn't show on the summer image. Recent is relative, any idea when it came down?

It shows up very clearly on google satellite view and the Landstat image is from 2020.

At full magnification you can see fallen trees and a pretty big mud slide.

And it does look very “fresh.”

 

[JoshandBaron]

It shows up very clearly on google satellite view and the Landstat image is from 2020.

At full magnification you can see fallen trees and a pretty big mud slide.

And it does look very “fresh.”

Yeah I saw it on current Google imagery but it doesn't show up on the "summer" Fatmap imagery linked by HH1. Curious what date the Fatmap imagery is from.


Edit: It first appears on imagery from 6/2018

 

[skiguy]

Not sure but maybe it is the slide track from this Avy in 2010. http://whitemountainsojourn.blogspot.com/2010/04/revisiting.html

http://whitemountainsojourn.blogspot.com/2010/05/ammonoosuc-ravine-avalanche-track-4-30.html

 

[HH1]

Get's more interesting.

Two Google earth low res images , top from 2017, bottom from 2018. As you can see no sign of the slide in the 2017 image. In the 2018 photo there's the slide with a bigger new one in Burt Ravine.

However from [URL="https://j3.org/2018/01/sherbie-lemonade/", a photo from a trip report dated Jan 14th 2018 clearly shows the slide in shade at photo centre: [URL="https://drive.google.com/file/d/1U2aMimNufO5-ZcPhkpDQ2PnG4gjFgQ4p/viewttp://"]

This suggests the slide happened in 2017 after the Google 2017 image was posted.

Oct 30th 2017 heavy rain event ([URL="https://www.conwaydailysun.com/news/local/heavy-rain-high-winds-wreak-havoc-in-valley/article_c6836bee-bdb4-11e7-8d59-cb1da76461ee.html"] could have been the cause.

 

[ChrisB]

I imagine with weather trends moving toward more violent and heavy precipitation events this slide activity will increase throughout the Whites.

 

[JustJoe]

I can't get an image of that area between 2013 and 2018. I also think it was probably from the Halloween storm of 2017.

 

[HH1]

The link shows three pics of the slide vicinity - 2013, first half 2017 and 2018. The blurry 2017 pic shows what might be a small slide, just a speck, in our area of interest.

Maybe this particular slide had its origins in the 2010 activity Skiguy points out.

http://drive.google.com/file/d/10XwRBlai0DwBlN3AcVs4JAs5m0d_2FY2/view?usp=sharing

 

[ChrisB]

The link shows three pics of the slide vicinity - 2013, first half 2017 and 2018. The blurry 2017 pic shows what might be a small slide, just a speck, in our area of interest.

Maybe this particular slide had its origins in the 2010 activity Skiguy points out.

http://drive.google.com/file/d/10XwRBlai0DwBlN3AcVs4JAs5m0d_2FY2/view?usp=sharing

Great sleuthing guys. Thanks!