# Major quake Bougainville PNG ---- NOW

1. Jan 21, 2017

### davenn

2. Jan 21, 2017

### davenn

Location map

M 8.0 40km W of Panguna, Papua New Guinea
2017-01-22 04:30:24 (UTC)
153.8 km deep

Last edited: Jan 21, 2017
3. Jan 21, 2017

### Staff: Mentor

USGS reports it as 8.0 - http://earthquake.usgs.gov/earthquakes/eventpage/us10007uph#executive
M 8.0 - 40km W of Panguna, Papua New Guinea
2017-01-22 04:30:24 UTC
Lat 6.267°S, Long 155.119°E
153.8 km depth - very deep
http://earthquake.usgs.gov/earthquakes/eventpage/us10007uph#map

• Panguna, Papua New Guinea (I wonder how much shaking they had?)
40.9 km (25.4 mi) W
Population: 2,916
• Arawa, Papua New Guinea
49.6 km (30.8 mi) W
Population: 40,266

4. Jan 21, 2017

### StevieTNZ

5. Jan 22, 2017

### davenn

yeah, that meant the max'ing out of my seismo didn't last as long as it would have for a shallower event

even at around 150+ km from the event, the shaking would be intense ... many major mining projects on Bougainville

Dave

6. Jan 22, 2017

### Baluncore

An earthquake at 154 km is quite deep. Note that this earthquake was 140 km east of the Planet Deep, 29,988 feet (9,140 m), the deepest point in the New Britain Trench, Solomon Sea.

The Planet Deep in the Solomon Sea was found by the German survey vessel SMS Planet in 1912. There was another eponymous 'Planet' Deep for a while in the Philippine Sea, but later survey vessels found deeper points nearby in the Philippine Trench.

The SMS Planet was scuttled at Yap Is, 7th Oct 1914 to avoid capture by the Japanese in WW1. The Yap Trench is only 35 km from Yap Island. It seems that there was some significant attraction between the SMS Planet and deep trenches.

7. Jan 22, 2017

### Staff: Mentor

I'm wondering what the peak ground acceleration was. I wonder if they have any accelerometers in place at any of the mines.

8. Jan 22, 2017

### davenn

looks like it got up around 80% of g

9. Jan 22, 2017

### davenn

raw seismogram screenshot off my system, just before it started to overwrite the previous line

Processed file

cheers
Dave

10. Jan 22, 2017

### Staff: Mentor

Oops, I mean wow! Is the tsunami warning still active? Or has there been one. $0.8 \,g$ sounded a lot.

11. Jan 22, 2017

### davenn

there was an alert put out, but was cancelled after it was found that there were no significant waves generated

pretty significant, but by no means the largest
exceeding 1g happens periodically with larger events, M6 and up ... lots of factors come into play, type of fault motion, ground type
to name a couple.
The M 6.3 quake that wrecked Christchurch, NZ in Feb. 2011 had a peak ground accel. of 220.3% g pretty much above the focus.
there was a soft ground location some 10 km to the north ( just east of the city centre) that hit 188.7% g

pretty serious recordings for a moderate event

Dave

12. Jan 22, 2017

### Staff: Mentor

On the other hand, that moderate quake was shallow, at a depth of 5 km (3.1 mi).

The Great Tohoku earthquake of March 2011 had PGA of ~3.0 g
More on PGA - https://en.wikipedia.org/wiki/Peak_ground_acceleration

13. Jan 22, 2017

### davenn

indeed ... makes a big difference
another in the list of the many factors that affect ground motion

14. Jan 24, 2017

### Mono Kakata

Astronuc, there are no operating mines on Bougainville at this time (nor since the late 1980s). I have reports from a few places along the west coast -- landslides, some houses knocked down, but so far no reports of fatalities. Also, the place Panguna hardly exists anymore. It references the copper mine there, which is no longer in operation.

15. Jan 24, 2017

### davenn

I didn't realise that