Author Archives: jfbucas

An earthquake of magnitude 6.9 occurred on the 21st November 2016 at 20:59:50 UTC in Japan. The epicentre was about 90 km southeast of Fukushima, see map below. No immediate damage or injury due to the earthquake tremor was reported. Tsunami alerts were issued by the Japan Meteorological Agency (JMA) and the Pacific Tsunami Warning Center for up to 3 metre high waves along the northern Pacific coast of Japan. According to JMA the highest measured wave was 1.4m in Sendai, Miyagi Prefecture, north of Fukushima. The Fukushima Nuclear Power Plant disaster on the 11th March 2011 was initiated primarily by the tsunami that followed the magnitude 9.0 Tōhoku earthquake.

The M6.9 earthquake was recorded at seismic stations worldwide, including stations of the Irish National Seismic Network (INSN), see seismic traces below.

For additional information please see these event pages:

JMA: http://www.jma.go.jp/en/tsunami/index.html

USGS: http://earthquake.usgs.gov/earthquakes/eventpage/us10007b88

EMSC: http://www.emsc-csem.org/Earthquake/earthquake.php?id=547259

GFZ: http://geofon.gfz-potsdam.de/eqinfo/special/gfz2016wxkb

More information about the INSN is available via this link.

2016-11-13, Earthquake in New Zealand, M7.8

An earthquake of magnitude 7.8 occurred on the 13th November 2016 at 11:02:57 UTC in New Zealand. The epicentre was about 100 km northeast of Christchurch, see figure below. The earthquake caused two fatalities and significant structural damage to buildings and highways has been observed. A state of emergency was put in place for the town Kaikoura, a town of about 2,000 people in the South Island, after it had been almost completely isolated with roads closed and phone lines down. Shortly after the earthquake struck a tsunami warning was issued and waves up to 2.5m high were observed on the northeastern coast of the South Island. According to Geonet the reason that a tsunami was generated by an earthquake with onshore epicentre is that there was deformation further down the fault plane offshore.

The event was recorded at seismic stations worldwide, including stations of the Irish National Seismic Network (INSN), see seismic traces below.

For further information please see USGS, Geonet NZ or GFZ. For further information about the INSN please follow this link.