Does This Red Line Mean Danger?!

I have been following earthquake activity for about a year and a half now, using whatever sources are available on the internet for up to date information, expecially the USGS site. I noticed today, a red line drawn on this one map, it is visible traveling along the area of Peurto Rico, across South America, around the west coast up to alaska and over toward Japan, you cannot see it all or where it all goes. It is not following the regular fault lines, in some areas it does, but others I don't get it! What have they drawn here?

earthquake.usgs.gov...

Better look quick, usgs has a way with taking down pages, if someone could post the image that would be great, I am at work and not able to post pics from here.

Under TIPS it says "Bold red lines are plate boundaries. White lines are roads."

Is that what you are talking about?

Accroding to the map legend the red line marks part of the eastern boundary of the Pacific Plate.

reply to post by space cadet


This is interesting - as I watch the quakes as well.
I have never noticed these lines before.
Anyone out there ever notice these?

Are these the plate boundries? In some areas they are running, I would agree, other areas, no way. And as long as I have been paying attention to these same maps, I have never seen them outlined like this.

reply to post by space cadet


pubs.usgs.gov...

How many of you quake watchers have ever clicked in on usgs and seen this particular marking?