and New Zealand (7.0)
sent me looking for a tool to see if the two quakes were antipodal (on the other side of the earth) to/from each other. This site is quite fun and useful:
What would you guess is antipodal to each location? Have a look. I was a bit surprised.
The New Zealand quake is described in this USGS link :
6/23/14 NEW ZEALAND QUAKE
And the Alaskan earthquake here:
6/23/14 ALASKAN ALEUTIAN ISLANDS QUAKE
Both areas are tectonically quite active. I currently have a friend in both locations so have been paying particular attention to the tsunami warnings in the Aleutian Islands.
Discussion of antipodal earthquakes is mostly anecdotal but this scientific paper looks at antipodal earthquakes as a way of determining that the earth's core is anisotropic:
ANISOTROPIC EARTH CORE AND EARTHQUAKES
*Here's a link to our earlier Richter Scale vs Moment Magnitude Scale discussion (if you need a review):
Moment Magnitude Scale vs. Richter Scale
And a bonus photograph of spectacular orthorhombic cornetite crystals: (take a close look at the color and crystal shape of this secondary copper mineral):
Any thoughts on Antipodal Earthquakes? Cornetite?
Whole lotta quaking' going on,
Antipodal Map (in case the tool isn't working):
Beach time at Medano Creek in The Great Sand Dunes, CO. And reading is fundamental...