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On the third day of a recent AGU Chapman Conference,held in Portland,Maine,near
 

Summary: On the third day of a recent AGU Chapman
Conference,held in Portland,Maine,near
the Two Lights fault zones and the Fort Foster
brittle zone,conference participants spent the
gray June day scrambling over rocky ledges
above the crashing surf along the coast of the
Atlantic Ocean.
With field trip leader Mark Swanson,who
with his students has studied the area in de-
tail over the past 20 years,participants exam-
ined evidence of ancient earthquakes from
about 300 million years ago when these rocks
were 8 to 10 kilometers deep.This evidence
included pseudotachylytes--glass generated
by heating during fault slip at midcrustal
depths.
In the preceding technical sessions of this
conference,there had been discussion of pseu-
dotachylytes.Now,for seismologists,this view
of an ancient earthquake rupture,occasionally

  

Source: Abercrombie, Rachel E. - Department of Earth Sciences, Boston University

 

Collections: Geosciences