System of Volcanic activity

P Hédervari P Hédervari

doi:10.4401/ag-5114

Abstract

A comparison is made among the systems of B. G. Escher (3), of R. W. van Bemmelen (1) and that of the author (4). In this connection, on the basis of Esclier's classification, the terms of constructiv e and destructive eruptions are introduced into the author's system and at the same time Escher's concept on the possible relation between the depth of magma-chamber and the measure of the gas-pressure is discussed briefly. Three complementary remarks to the first paper (4) 011 the subject of system of volcanic activity are added.

Highlights

SUMMARY. — A comparison is made among the systems of B
On the same physical base — that is taking into account the gas-pressure of magmaon one handandthedegree of fluidity onthe other — Escher (3) has elaborated a system which is similar to that of v a n Bemmelen, not the same
Escher's (3) classification can be found in Table I I

Summary

PART

SUMMARY. — A comparison is made among the systems of B. Van Bemmelen (1) and that of the author (4) In this connection, on the basis of Esclier's classification, the terms of "constructiv e " and "destructive" eruptions are introduced into the author's system and at the same time Escher's concept on the possible relation between the depth of magma-chamber and the measure of the gas-pressure is discussed briefly. A seguito di ciò, nel sistema dell'autore vengono introdotti i termini di eruzioni « costruttive » e « distruttive », in base alla classificazione di Escher e — nello stesso tempo — viene brevemente discusso il concetto dello stesso Escher su una possibile relazione fra la profondità di camera del magma e la misura della pressione del gas.

TABLE I

Very shallow

Thinly fluid Medium

Transitional between moderate and high

Merapi high