A preliminary investigation into possible methods for the location of the foci of local earthquakes

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Barker, P.H. 1955 A preliminary investigation into possible methods for the location of the foci of local earthquakes. [s.l.]: [s.n.]. Report / Geophysics Division 23 20p

Abstract: The occurrence of small earthquakes in the area surrounding a volcano is a well known phenomenon. Although the exact link between the two is not clearly understood it is considered that a knowledge of the foci of a number of these earthquakes may throw some light on the processes involved in a volcanic eruption, These earthquakes have been studied by other workers (1 to 10) but it is hoped that the investigation contemplated will enable a more precise estimate of the position of the foci to be obtained. In addition we will obtain information on the volcanoes with which New Zealand is most directly concerned, (Ruapehu, Ngauruhoe and Tongariro). The equipment described could also prove useful in the investigation of similar phenomena, such as the aftershocks following a major earthquake. The first two sections of this report summarise the relevant characteristics of volcanic earthquakes and aftershocks. In the third section the various methods of location are surveyed and the possibility of using a network of tripartite stations to obtain an epicentre is pointed out. In the final section a brief description of the suggested equipment is given, while appendices contain detailed discussions of the design and construction of various units (auth)