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Suiyo Seamount is associated with a magnetic anomaly: ocean-floor surveys of it and the surrounding area found that a large negative rock body existed to the east of the seamount, while positive bodies existed to the northwest and south. The reasons for this complex anomaly, which also exists in several other nearby seamounts, is unknown, but is suggested to be the result of interactions between different magnetic fields of different ages.
A burst of hydrothermal activity was observed in July of 1991, raising water temperatures at the vent to 290 °C (550 °F); following the event, the volcano, until then thought extinct, was reclassified as active by the Japan Meteorological Agency. A bathymetric survey of the volcano found sulfur-oxidizing microbes to be predominant, and concluded that Suiyo Seamount was a natural "incubator" for this bacterial type.