SHORT-TERM REGISTRATION OF ELECTRICAL FIELD VARIATIONS

DURING VOLCANIC ERUPTIONS

Physikalisch Vulkanologisches LaborUniversität Würzburg

Physikalisch Vulkanologisches LaborUniversität Würzburg

+

rec e p to r

am p lifie r

m u lti-c han n e llog ger

L E D

trig g e r

+E

Volta

g e

D istanceDistance

0 5 10 15 20 25-0,4

-0,2

0,0

0,2

0,4

0,6

0,8

1,0

1,2

1,4 first max. Amplitude

y = a*x^ba 0.964b -1.09496

volta

ge [V

]

distance [m]

charge separation by uni-axial expansionbest fit source model: line-charge

9 10 11 12

-1,5

-1,0

-0,5

0,0

volta

ge [V

]

time [s]

trigger 10 Hz Low Pass Filter on A5QUHALB100B16_e0 10 Hz Low Pass Filter on A5QUHALB100B16_e1 10 Hz Low Pass Filter on A5QUHALB100B16_e2 10 Hz Low Pass Filter on A5QUHALB100B16_e3

Physikalisch Vulkanologisches LaborUniversität Würzburg

Laboratory

Physikalisch Vulkanologisches LaborUniversität Würzburg

deliveries type of eruption and relative magnitude can be monitored fragmentation intensity is mirrored by electrical signals

ash production can be scaled using fragmentation experiments

milestones permanent stations on Grimsvötn and Hekla & 3 mobile stations

calibration to local magma properties and geometry

on-line measurement of ash production and energy release

Scientific crew : Bernd Zimanowski, Ralf Büttner, Andrea SchmidTechnician : Anton Uttinger