ETS Event of Winter 2017

Shortcuts:
Main Tremor Index  |  Interactive Tremor Map  |  Realtime Tremor Map |
ETS diagnostic Spectrograms (blue boxes)  |  Compare Maps |
PGC TAMS/SSA (requires special account) | PANGA geodesy plots

Blog for ETS of Winter 2017 

Deep Tremor News: Jan, 2017

This BLOG-like page is being generated in a form similar to previous ETS ones to document and provide information on a Northern Washington ETS that should start sometime between late January and March 2017.  There are no special experiments in the field for this ETS. The Imaging Magma Under St. Helens (iMUSH) experiment terminated last summer.  We will be tracking and reporting on this ETS using data only from the real-time regional networks (UW,  UO, CN, TA, PB, CA) and/or information reported to us by others.

ETS dates:  

Start: Feb. 17, 2017

Unknown end dates as of now.

Information will be posted on this page (latest at the bottom) and references to figures from time to time.

NEWS (latest is at the bottom):

Jan 23, 2017 - Tremor throughout Cascadia seemed to have been relatively quiet over the past four months, but a detailed look at the data used by the wech-o-meter showed that for four of our subgroups there were many station problems or outages that likely made it much less sensitive for the past 6 months or more than it was in the past.  Details of this are provided in the blog about the coming ETS.

Jan 28, 2017 - In response to the loss of a number of stations in the far south and far north sub-regions: NV NC and CC) we have arranged to receive a few other data channels from our cooperating networks (Canadian National Seismic Network, the Berkeley Seismic Network and Northern California Seismic Network).  These have now been configured in to the wech-o-meter.  Data channels from the sub-regions where this ETS is expected (BC,NW,SM) are in pretty good shape and thus remain in the same configuration as before.

Feb 21, 2017 - I am thinking that the ETS has started.  Five days with from 5 to 17 hours each day with moderate to strong tremor in the area directly west of Seattle seems to be a pretty good sign of it starting.  There also looks to be a hint of a slight migration up-dip and to the north, which is typical of an ETS event.  This seems to be pretty close to right on schedule as well, ~14 months since the last one started for this section on Dec. 22, 2015 .  Thus I am calling this ETS to have started.  Of course, to spite me the tremor gods will probably stop in now.  More will be posted here as it develops.