Mag. 7 Indonesia Earthquake - 5th August 2018

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Thirty nine people have died after a powerful earthquake rocked the Indonesian tourist islands of Lombok and neighbouring Bali, triggering a tsunami warning just a week after another quake in the same region killed 16 people.

The magnitude seven earthquake hit about 6.46pm Jakarta time (11.46pm NZ) on Sunday, 27 kilometres north-east of northern Lombok in Indonesia at a 15-kilometre depth.

https://www.stuff.co.nz/world/asia/...and-indonesian-officials-say-tsunami-possible
 
That's first M7 event since Feb 2018

The USGS have down graded it to 6.9

The count for M7.0 - 7.9 events this year is well down on the long term averages.
By now there should have been around 10 - 12 in that range there have been only 5 and they were all back in Jan and Feb.
18 / year is the long term avg.

M6.0 - 6.9 events are also well down compared to the averages. So far 49 for the year.
The annual avg is around 130

So far there hasn't been the M8+ event for the year eitherfrom my seismograph
http://www.sydneystormcity.com/seismograms.htm

Seismograph trace stacked in horizontal strips over about an hour, with a large burst of shaking in the middle and a much stronger band near the lower centre. Axis labels include Maximum Velocity 50.5708um at 08/05 12:18:32.


cheers
Dave
 
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  • Seismograph trace stacked in horizontal strips over about an hour, with a large burst of shaking in the middle and a much stronger band near the lower centre. Axis labels include Maximum Velocity 50.5708um at 08/05 12:18:32.
    zhi.gif
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Greg Bernhardt said:
I just got back last week from Bali. I've been messaging a lot of friends I made over there.
Everyone alright?
 
The aftershocks continue on Lombok Island.
As I am typing this the latest respectable ( and largest, so far) aftershock is tailing off.

M 5.9, 3km SE of Todo, Indonesia
2018-08-09 05:25:31 (UTC), 10.0 km deep

The red dot on the map


This is about 40km WSW of the M6.9 main shock

I have taken the USGS base map and added the event magnitudes to it...

Satellite map of Lombok island, Indonesia, with yellow and one red dots marking earthquake aftershock epicentres labelled with magnitudes from 4.5 to 6.9; scale bar reads 10 km.


apologies for the low quality image
the forum does a lot of compression

cheers
Dave
 
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  • Satellite map of Lombok island, Indonesia, with yellow and one red dots marking earthquake aftershock epicentres labelled with magnitudes from 4.5 to 6.9; scale bar reads 10 km.
    upload_2018-8-9_16-14-46.png
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davenn said:
it was only a 5.9 as stated above and in that article :smile:
Stuff must have updated the article to 5.9.
 
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Seismogram for the M 5.9 aftershock

Multi-row seismogram trace from station DNSO in Sydney, showing a long strong burst of ground motion in the middle rows and a larger spike near the end, with time axis in minutes and footer reading Maximum Velocity 8838.64nm.
 
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  • Multi-row seismogram trace from station DNSO in Sydney, showing a long strong burst of ground motion in the middle rows and a larger spike near the end, with time axis in minutes and footer reading Maximum Velocity 8838.64nm.
    180809 UT M 5.9 ashk Lombok eastern Indonesia zhi2.gif
    97.9 KB · Views: 1,045
And again:
Lombok in Indonesia has been hit by another series of earthquakes - including a major 6.9 magnitude quake - which left one person dead and caused others to run out into the streets in panic.

The latest tremors arrived two weeks after a 7.0-magnitude earthquake killed 460 people on the island and caused damage worth more than 5 trillion rupiah (£268 million).
https://www.independent.co.uk/news/...-lombok-island-second-magnitude-a8498406.html
 
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