Panama Aftershocks Reveal Likely Fault Solution

All rightee… We have a number of aftershocks that are lighting up the potential fault that ruptured a couple days ago. Here is my page for this earthquake. Here is the USGS page.
The aftershocks are aligned with the north-south transform fault system (named the Colba Ridge) that separates the Cocos plate to the West and the Nazca plate to the East. Here is the local map with historic epicenters in gray and the mainshock and aftershock epicenters plotted as orange circles. Note that many of the historic epicenters also align along this fracture zone.


Here is a map with only the recent epicenters in orange.


Here is an updated moment tensor (Mwb). With these aftershocks, we can better interpret this as rupture on a N-S striking right-lateral fault.

There are 5 moment tensors on the USGS page. For those looking for a refresher on focal mechanisms, here is the USGS page that describes them.

Here is the USGS poster that describes the historic seismicity and plate tectonic setting.


Here is a more comprehensive view of the local and regional tectonics in this region. This is a compilation by Harley M. Benz and others.

3 thoughts on “Panama Aftershocks Reveal Likely Fault Solution

  1. Pingback: Jan 31, 2015 Panama fracture zone shakes it up | Jay Patton online

  2. Pingback: Jan 31, 2015 Panama fracture zone shakes it up | earthjay science

  3. Pingback: Panama fracture zone strikes again | Jay Patton online

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