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Additional Reports

Reports are sometimes published that are not related to a Holocene volcano. These might include observations of a Pleistocene volcano, earthquake swarms, or floating pumice. Reports are also sometimes published in which the source of the activity is unknown or the report is determined to be false.

Pumice Rafts (Ryukyu Islands)

Ryukyu Islands, Japan

Index of Monthly Reports

Reports are organized chronologically and indexed below by Month/Year (Publication Volume:Number), and include a one-line summary. Click on the index link or scroll down to read the reports.

06/1986 (SEAN 11:06) Discolored seawater

Contents of Monthly Reports

All information contained in these reports is preliminary and subject to change.

06/1986 (SEAN 11:06) Discolored seawater

Pumice rafts have been drifting ashore in the Ryukyu Islands from late May through June 1986. Pumice was observed by JMA weather station personnel on eight islands: Amami-Oshima, Okinawa, Kume, Minami-Daito, Miyako, Ishigaki, Yonaguni, and Iriomote. More pumice has been observed on E coasts (Pacific coasts) than W coasts of the islands. The coarsest pumice was ~20 cm in diameter on Okinawa, but most of the pumice was small. On most islands, some pumice carried shellfish on the surface. No recent eruptions have been reported at volcanoes in and near the Ryukyu Island chain, and the source of the pumice is unknown.

Information Contact: JMA.