ETS Event of Summer 2019
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Blog for ETS of Summer 2019
Deep Tremor News: Spring - Summer. 2019
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 April and May, 2018. There are no special experiments in the field for this ETS. We will be tracking and reporting on this ETS using data only from the real-time regional networks (UW, UO, CN, PB, CA) and/or information reported to us by others.
Produced by Steve Malone, PNSN Professor Emeritus
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):
Apr. 8, 2019 - As of right now the expected main Puget Sound - Vancouver Island ETS event is probably still several months away. It should start in July-Aug plus or minus a month if the interval between events stays similar to the past and depending if it starts in Puget Sound (earlier) or Vancouver Island (later). However, this blog is starting early because there has been tremor activity in the spring of 2019 that has some characteristics of a Puget Sound ETS event. Many observers have been questioning if this is a classical northern-Washinngton ETS event taking place very early. As of now, we think it is NOT but rather is a strange inter-ETS sequence of tremor. A "regular "Observations" report has been posted with some thoughts about what we (I) think may be taking place. This current ETS blog will be updated in the summer when the real thing gets going.
Apr. 11, 2019 - Oops. I discovered some problems with my "regular "Observations" page I posted a few days ago and have had to post an "Oops, retraction/correction Observation" page in response. More will continue here as this situation develops.
Apr. 15, 2019 - I just add a bit more here even though the main northern Puget Sound ETS has not yet gotten going. The southern Puget Sound and southern Washington has continued to have some tremor. After a brief pause in tremor activity from Apr 9 -11 tremor again picked up on Apr 12 and has continued to slowly migrate south. As mentioned in the "regular "Observations" page and a previous Observations page by Mouse Reusch one of the central Oregon ETS events propogated north into southern Washington a little over a year ago. Current tremor activity is overlapping this area just northwest of Portland right now. The main Oregon ETS events in the past have had inter-event times of almost two years, thus the current activity extending into Oregon again seems too early if it is covering some of the same region. Time will tell.