M6.3, 6.4 -- a double whammy E of New Caledonia

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The discussion centers on two significant seismic events near Tadine, New Caledonia: a magnitude 6.3 earthquake occurring 170 km ESE and a magnitude 6.4 earthquake occurring 167 km E. These events are classified as separate due to identifiable P and S wave generation, despite their proximity in time (35 minutes apart). The M 6.3 is categorized as a foreshock, while the M 6.4 is considered the main shock. The amplitude of these earthquakes was surprisingly low compared to similar historical events in the region, which have been recorded in the high 6's.

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M 6.3 - 170km ESE of Tadine, New Caledonia

M 6.4 - 167km E of Tadine, New Caledonia

and a bunch of aftershocks following shortly after ...

5.8, 5.1, 5.2, 5.4

181016 UT M6.3 and 6.4 New Calidonia zhi.gif

upload_2018-10-16_12-58-17.png

Cheers
Dave
 

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So why aren't these classified as the same earthquake? Too much time between them?
 
Drakkith said:
So why aren't these classified as the same earthquake?

because, tho they are in the same area, they are two very clearly separate and identifiable events, just as all the aftershocks that follow.
Drakkith said:
Too much time between them?

No, even with them being much closer in time, than the 35 minutes they were, it wouldn't matter as long as separate P and S
wave generation and arrivals can be identified.

With this sequence, the M 6.3 can be classed as a foreshock and the M 6.4 as the main shock.
(on a side note, I am quite surprised that they only got 6.3 and 6.4 considering the amplitude.
I have seen similar amplitude events from that area listed in the high 6's (6.6 - 6.9))Dave
 
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