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hi Gang :)
interesting set of earthquakes in the central NZ region in Cook Strait, between the 2 main islands
the last M6+ event that I recall in this area ( and almost in the same spot) was a 6.2 in the 1980's. This a complex tectonic region where there is a change from oblique slip across the South Island changing to a subduction zone under the northeastern most corner of the South Island and under the North Island.
These events have occurred in the centre of that zone and appear to delineate a fault striking approx. NW-SE. The USGS moment tensor supports this conclusion.
I was in Christchurch, some 400km to the SW at the time of the M5.7 ( the first event) but didn't feel it. It would appear that only a few people in Christchurch felt the M6.5.
The first event (M5.7) was preceded by several foreshocks of ~M1.5 - M2.5 in the 2 day before the event. The 5.7, 5.8 and 6.5 had their own good set of aftershocks so far totally in excess of 300 events.
Unfortunately my digital seismograph computer decided to have a hard drive failure at the time of the M6.5 so am unable to show you a seismogram of the event.
Regards
Dave
interesting set of earthquakes in the central NZ region in Cook Strait, between the 2 main islands
the last M6+ event that I recall in this area ( and almost in the same spot) was a 6.2 in the 1980's. This a complex tectonic region where there is a change from oblique slip across the South Island changing to a subduction zone under the northeastern most corner of the South Island and under the North Island.
These events have occurred in the centre of that zone and appear to delineate a fault striking approx. NW-SE. The USGS moment tensor supports this conclusion.
I was in Christchurch, some 400km to the SW at the time of the M5.7 ( the first event) but didn't feel it. It would appear that only a few people in Christchurch felt the M6.5.
The first event (M5.7) was preceded by several foreshocks of ~M1.5 - M2.5 in the 2 day before the event. The 5.7, 5.8 and 6.5 had their own good set of aftershocks so far totally in excess of 300 events.
Unfortunately my digital seismograph computer decided to have a hard drive failure at the time of the M6.5 so am unable to show you a seismogram of the event.
Regards
Dave
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