Vol Lecture Notes 1

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 0 m . Highly viscous lavas effectively do not flow horizontally at all, forming vertically extuded domes. “Spines” represent perhaps the most viscous la v a s . Incandescent Lava Dome of Soufriere Hills, Montserrat, 2003 15 Evolution of the Mt. Pelee Spine 1902 1902 1903 Aspect Ratio Define aspect ratio as: t/l where t is thickness and l is length where ( n o te : s o m e tim e s d e fin e d a s r a tio o f th ic k n e s s to a r e a ) Depends on physical properties t/l = τ0(Fη)-1/4(gρ)3/4 W h e r e F is e ffu s io n r a te 16 Flow Lengths Predicting length of a lava flow is complex F o r a n a ’ a f lo w , it d e p e n d s o n d is c h a r g e r a te , th e r m a l d iffu s iv ity , th e r m a l r a d ia n c e , s tr e n g th o f th e c r u s t, s lo p e , a n d d e n s ity : L = [(1.5! S / " g )2 ( #$ T 4 ) / (T%"c p )] / sin 2 & Σ is s u r fa c e e m is s iv ity , σ is S te p h a n B o ltz m a n n c o n s ta n t, ε is e x te n s io n b e fo r e fa ilu r e o f c r u s t, S is te n s ile s tr e n g th o f c r u s t 17...
View Full Document

This document was uploaded on 03/04/2014 for the course EAS 458 at Cornell University (Engineering School).

Ask a homework question - tutors are online