First seismic T-Phase events for 2015

  • Thread starter davenn
  • Start date
  • #1
davenn
Science Advisor
Gold Member
9,435
8,338
hi everyone,
Well we are into a new year and into new discoveries and observations

Yesterday morning, Jan 6th, 0548NZST ( 05 Jan 1748UT) there was a reasonable quake in the mountains of the central South Island of New Zealand M 6.0 GNZ ( M 5.6 USGS). Now the quake itself isn't unusual, NZ is prone to regular quakes because of its location straddling the Indo-Australian Plate and Pacific Plate boundary.
What was unusual is that this is the first time I have seen/recorded T-phase waves from an inland event.
All previous events have been under the seafloor, see previous thread .... https://www.physicsforums.com/threads/seismic-t-waves.785155/

This first image is of the long period seismogram to show the overall quake. The T-phase is not identifiable in this image as it is buried in amongst the surface waves

150105 174842UT M5.6 ( 6.0GNS) Sth Is event with T-phase1.jpg



This second image shows the P wave arrival at 1752UT and the T-Phase arriving at ~ 1810UT
Note its amplitude is much larger than either the P or S arrivals ( actually the S wave arrival cannot be seen)

150105 174842UT M5.6 ( 6.0GNS) Sth Is event with T-phase .jpg



The surprises that this subject of seismology is still coming up with :)

cheers
Dave
 

Answers and Replies

  • #2
Bystander
Science Advisor
Homework Helper
Gold Member
5,203
1,225
I was going to ask about that. Been on the news for hours, and no post, I was starting to wonder.
 
  • #3
davenn
Science Advisor
Gold Member
9,435
8,338
It was out in the middle of nowhere. Arthur's Pass would have been about the closest community, maybe Cass. I have not heard of any damage reports. Tho many closer in probably did have crockery off shelves etc
 

Related Threads on First seismic T-Phase events for 2015

  • Last Post
Replies
7
Views
6K
  • Last Post
Replies
9
Views
3K
  • Last Post
Replies
5
Views
5K
  • Last Post
Replies
4
Views
2K
  • Last Post
Replies
5
Views
2K
Replies
8
Views
2K
Replies
17
Views
3K
Replies
13
Views
6K
  • Last Post
Replies
3
Views
5K
Replies
1
Views
1K
Top