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Figure F10. Examples of tremor- and steplike P transients caused by storms or very low frequency (VLF) earthquake swarms, respectively. A. Onset of microseism in the detided and high-pass filtered pore pressure data caused by the approach of Typhoon Chaba toward the end of the monitoring period (i.e., when the Chikyu was already at sea for Expedition 332). B. Excess pore pressure increase exceeding 300 Pa, which is believed to have been caused by a swarm of VLF earthquakes within the Nankai Trough accretionary complex. See text.

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