You are a U.S.G.S. volcanologist sent out to investigate a supposedly dormant vo

Question

You are a U.S.G.S. volcanologist sent out to investigate a supposedly dormant volcano in New Mexico. There have been recent small earthquakes and positive elevation changes near the summit of this volcano.

By carefully mapping the youngest ash flow layer, you produced an isopach map of the lateral extent and vertical thickness of this layer:

What is approximate areal extent (D) of the ash flow unit? __________________Km2

(Assume area is an ellipse: Area = 1/4xy where x is horizontal axis, y is vertical axis)

MALPAISILLO 19 November 2 December 1995 /0.5 mm Max thickness = 50 cm 2-5 June 1995 Cerro Rota 1.0 mm Amapola 0.01 Tmax cm Cebaza ,' de Vaca 1230·N Las Pilas Ei Ho Ojo de olcanic om 10 5.0 0.1cm 3.0-4.0 ua 2.0 Cerro Asososca 0.5 Laguna de Asososca 1.0 km eon 86 45'W UTM 515 520 O 525 530 535 D

Explanation / Answer

Put the scale over the area, the approximate length and breadth u will get is

length appx 8 km

width appx 6 km

so Area= Appx =603 km2

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