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I have been fascinated by a line of earthquakes running parallel with the East Rift Zone and finally figured out I have been looking at "The Great Crack". I have heard of it before, and no it is not in Kau. Perhaps they have a crack too, however, it is not as great.
I have published a blog spot showing the exact location and satellite views of the great crack.
http://volcanotremor.blogspot.com/2018/0...-rift.html
This is part of a larger effort to measure volcanic tremors using imaging software. You can see that effort on the blog spot too.
I never hiked to the great crack and am looking for people that have been there and have photos. Thanks
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The first reference to the Great Crack was in 1823 and this was along the Puna Trail. The Puna Trail was and still is in Puna and and is sometimes called the Kalapana Trail. I don't doubt there is a place in Ka'u called the great crack too. However, that does not negate the fact this crack is also called the great crack. I would be happy to use a different name for the crack if there is a different and more formal one. Reference:
https://www.hawaii247.com/2014/07/18/vol...tune-time/
Former Puna Beach Resident
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The first reference to the Great Crack was in 1823 and this was along the Puna Trail.
pbmaise -
I think we are running into a problem here with names and terminology. If you refer to the crack in your blog as The Great Crack almost everyone will assume you mean The Great Crack or Hilina Slump in Ka'u. Google search the terms and you'll find pages of information on The Great Crack in Ka'u and nothing on a crack in Puna.
The article you reference:
https://www.hawaii247.com/2014/07/18/vol...tune-time/
mentions a Great Crack near Puna Trail crossing. I believe this may refer to the westernmost end of the Puna Trail where it can connect to the Hilina Pali Trail on short side trails - - that location is much closer to The Great Crack, and not the Puna crack you describe.
You may wish to find the real name for the crack in Puna, perhaps on older maps, or at least refrain from calling it The Great Crack in order to avoid confusion.
Portion of Hawaii’s drinking water that comes from underground wells : 9/10
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I do think you need to call this by another name. The Great Crack is well documented in Ka'u. On the other hand, the map that TomK referenced,
https://www.topozone.com/hawaii/hawaii-h...eat-crack/ does show a crack extending from Chain of Craters road running parallel to the coast towards the east. You need to scroll the map to that area and the cracks is marked in a couple of locations. I, too, had been seeing that line of earthquakes over the past 2 weeks and wondered what was going on there. We need to ask USGS for more information.
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Might the crack turn into a landslide/slump event?
https://hilo.hawaii.edu/~kenhon/GEOL205/...efault.htm
Surely not in our lifetimes, but what if there is evidence the crack is widening? Are the Leilani events are part of the process?
The Kalapana and now Leilani flows are adding more and more weight to the Puna shoreline. Perched above ocean.
Experts here can inform us if this is an abyssal plain, i.e., deep water. A precipitous underwater slope generally means greater possibility of slump.
This map allows a nice close-up. Use magnifier. (The Hilina Slump and Loihi are shown.)
http://www.shadedrelief.com/hawaii/maps/..._Small.jpg
What is reported to have happened to the entire east side of Oahu, resulting in the Koolau Range, suggests the catastrophic nature of these events. Fortunately the time frame is generally in 100,000s of years.
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The new island of Puna Makai!!
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Considering how much time has been put into studying Kilauea’s features, and especially those associated with the magmatic processes and resulting land deformation, I think any speculation of specific features like the Hilina Pali Slump complex would be best if it included references to the reams of material already published on the subject.
For instance, a former HVO staff geophysicist who specializes in the deformation of Kilauea, Roger Denlinger, in his pager titled
Instability of Hawaiian Volcanoes, goes a long way towards describing the features you are referring to. Further, in Roger’s paper he shows why there is every reason to see earthquakes but none to anticipate eruptions in the area you are fixating on. Roger's paper can be read here:
https://pubs.usgs.gov/pp/1801/downloads/...linger.pdf
