(Table 2) Picked maximum velocities from 3 radars (RAY, SHK, and SUM), showing 10 explosions at Erebus volcano, Antarctica, and their respective directivity vectors ...

• Main Authors: Gerst, Alexander, Hort, M, Kyle, Philip R, Vöge, Malte
• Format: Dataset
• Language: English
• Published: PANGAEA 2008
• Subjects: Event label; Latitude of event; Longitude of event; Elevation of event; DATE/TIME; Velocity magnitude; Velocity, standard deviation; Azimuth; Standard deviation; Inclination; Doppler radar, frequency modulated continuous wave; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158; Arctic; Antarctic; Lava Lake; Antarc*; Antarctica; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.847914; https://doi.pangaea.de/10.1594/PANGAEA.847914

We used a novel system of three continuous wave Doppler radars to successfully record the directivity of i) Strombolian explosions from the active lava lake of Erebus volcano, Antarctica, ii) eruptions at Stromboli volcano, Italy, and iii) a man-made explosion in a quarry. Erebus volcano contains a convecting phonolite lava lake, presumably connected to a magma chamber at depth. It is one of the few open vent volcanoes that allow a direct observation of source processes during explosions. Its lava lake is the source of frequent violent Strombolian explosions, caused by large gas bubbles bursting at the lake surface. The exact mechanism of these bubble bursts is unclear, as is the mechanism of the creation of the infrasound signal accompanying the explosions. We use the Doppler radar data to calculate the directivity of Strombolian eruptions at Erebus. This allows us to derive information about the expected type of infrasound source pattern (i.e. the role of a dipole in addition to the monopole signature) and ... : When the bubble expansion phase lasted for more than 1 s, several directivity vectors were calculated. Error boundaries on the picked velocities were determined manually, and their propagation on the directivity vectors were calculated. Note that errors due to unprecise station locations are negligible compared to errors resulting from picking uncertainties. ...