Mangapoike landslide is at 38°51'5.87"S 177°39'42.05"E
The landslide occurred in summer, little precedent rainfall, no local seismicity.
The closest Geonet GNSS station recorded a vertical uplift event coincident with
the landslide.
Kauhauroa-1 well is at 38°56'52.85"S 177°25'35.84"E downdip from Mangapoike.
The well encountered significant gas overpressures and achieved a stabilized flow of 11.5 million standard cubic feet per day. The well was not completed; the drill pipe was stuck, and it is still in place waiting to be plugged and abandoned.
We have seen the results of overpressure on the East Coast North Island New Zealand. Wells drilled near Wairoa in the last century had pressures near lithostatic, and some of them have not been plugged and abandoned. They are orphan wells. In 2018 a large landslide occurred in the sandstones updip, and there was gas present at the surface. As a result there is now a 50m deep lake behind the landslide dam (Mangapoike). This is another accidental lake.
Mangapoike landslide is at 38°51'5.87"S 177°39'42.05"E
The landslide occurred in summer, little precedent rainfall, no local seismicity.
The closest Geonet GNSS station recorded a vertical uplift event coincident with
the landslide.
Kauhauroa-1 well is at 38°56'52.85"S 177°25'35.84"E downdip from Mangapoike.
The well encountered significant gas overpressures and achieved a stabilized flow of 11.5 million standard cubic feet per day. The well was not completed; the drill pipe was stuck, and it is still in place waiting to be plugged and abandoned.
We have seen the results of overpressure on the East Coast North Island New Zealand. Wells drilled near Wairoa in the last century had pressures near lithostatic, and some of them have not been plugged and abandoned. They are orphan wells. In 2018 a large landslide occurred in the sandstones updip, and there was gas present at the surface. As a result there is now a 50m deep lake behind the landslide dam (Mangapoike). This is another accidental lake.
Amazing, can you send me a pin so I can check it out on satellite?
That's really interesting thanks!