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The first sign of magma accumulating beneath Miyakejima, an island volcano in the northern Izu islands, Japan, came at around 18:00 on 26 June 2000, when a swarm of earthquakes was detected by a volcano seismic network on the island. Earthquakes occurred initially beneath the southwest flank near the summit and gradually migrated west of the island, where a submarine eruption occurred the next morning. Earthquakes then migrated further to the northwest between Miyakejima and Kozushima, another volcanic island and developed to the most intense earthquake swarm ever observed in and around Japanese archipelago. To better image how the initial magma intrusion occurred, we relocated hypocenters by using a station-correction method and a doubledifference method. The relocated epicenters are generally concentrated near the upper bound of dyke intrusions inferred from geodetic studies throughout the initial stages of the 2000 eruption at Miyakejima from 26 to 27 June 2000. As for seismic activity westward off Miyakejima in the morning on 27 June, hypocenters from both a nationwide seismic network that were relocated by the double-difference method, and those from the volcano seismic network relocated by the station-correction method, formed a very shallow cluster that ascended slowly with time as it propagated northwestward from Miyakejima. This suggests that the dykes have both a radial and upward component of movement.

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Edwardsiella tarda is a bacterium that is associated with both an asymptomatic oral carrier state and selflimiting diarrhoeal illness in humans. We herein report a case of sepsis and liver abscess caused by E. tarda and review the patients with E. tarda sepsis who presented at our hospital. An 85-year-old woman developed enterocolitis and sepsis caused by E. tarda. She was administered intensive care and thus was able to soon show a good recovery, however, she subsequently developed a liver abscess. During a complicated course, she continued to be treated with antibiotics and after a successful course was discharged on the 44th day after admission.

No abstract