Air inspection of Asama Volcano (1 October 2004) [Volcano Research Center] [2004/10/04]

Tilt change in the borehole (depth 30m) of the Asama Volcano Observatory (in Japanese)[Volcano Research Center] [2004/09/30]

Crustral deformation around Asama volcano [Volcano Research Center] [2004/09/06]

Gravity change related to the volcanic activity of Asama eruption (in Japanese)[Gravity measurement group] [2004/10/01, continually-revised]

Reports of field survey on the tephra of the erupution in 2004/09/01 [Volcano Research Center] [2004/09/06, last updated 2004/09/09]

On the characteristic of tephra and the chemical compositions of vitric cinders related to the eruption in 2004/09/17 (in Japanese)[Volcano Research Center] [2004/09/30]

On the tephra of the eruption in 2004/09/23 (Flash report) (in Japanese)[Volcano Research Center] [2004/09/30]

The record of seismic wave measured by broadband seismograph in 2004/09/01 (at Asama Volcano Observatory) [Earthquake Information Center] [2004/09/06]

Comparison of sesimic waves related to the eruption in 2004/09/01 and 2004/09/23 (at Asama Volcano Observatory) (in Japanese)[Earthquake Information Center] [2004/09/30]

Airwave records observed at about 19:44 in 2004/09/23 (in Japanese)[Airwave observation group] [2004/09/30]