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Originally posted by The Great Day
just talking to my wife in the Philippines and a 6.8 went off next island over...she ran outside. Rain is bad...there is going to be a lot of landslides.
Ive been watching for a few years now and the activity is really picking up.......
im in Vancouver right now following the westcoast threads.....
The recent discovery of Episodic Tremor and Slip (ETS) in subduction zones is based on slow slip episodes visible in GPS observations correlated with non-volcanic tremor signals on seismometers. ETS occurs just inboard from the region capable of great megathrust earthquakes, however, whether there is any communication between these two processes remains unknown.
In this study we use new single-station methods to compile an ETS catalog for the entire Cascadia subduction zone and compare the patterns with a variety of along-strike trends for the subducting and overriding plates. Correlated ground vibrations and strain observations are found all along the subduction zone, demonstrating ETS is an inherent part of the subduction process. There are 3 broad (300-500 km), coherent zones with different recurrence intervals (14+/-2, 19+/-4, 10+/-2 months), where the interval duration is inversely proportional to upper plate topography and the spatial extent correlates with geologic terranes.
These zones are further divided into segments of ETS that occur at times typically offset from each other. The 7 largest (100-200 km) segments appear to be located immediately landward from fore-arc basins interpreted as manifestations of megathrust asperities, implying there is a spatial link between ETS and earthquake behavior. It is not yet clear if any temporal link exists, but the regional "hold time" between ETS episodes could be controlled by strength variations due to composition of geologic terranes.
Originally posted by westcoast
Thanks for the info. I have noticed links between the deep tremors and quakes for awhile now and have suggested as such in my deep tremor threads (see link in sig), but I think that this is the best correllation.
Great job in narrowing down the tremor times/location vs the quake.
Originally posted by westcoast
ETA: Zworld, that gets me ALL the time. I still don't have the differences memorized. You would think, for a study based in PST that the time would indicate as such!!!
Originally posted by qmantoo
The time is UTC because you have to have a standard somewhere to compare with other events in other places in other time zones.
To show this in another way but not sure if the area covered may be too small/large to show any buildup.
Originally posted by zworld
Originally posted by UdonNiedtuno
Does the lack of deep tremors in the middle of this zone indicate energy storage?
To clarify, does this image make you think that if a big quake were to hit soon, that it would be centered around Portland? I still haven't strapped my house to the foundation! I suppose I better get on that...