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Category Archives: Recent Global Seismic Events

2018-08-19, M8.2, Fiji Region

On the August 18, 2018, M 8.2 earthquake near Fiji occurred as the result of deep, normal faulting approximately 560 km beneath the South Pacific Ocean several hundred kilometers to the west of the Tonga Trench. There were no reports of casualties.

Earthquakes that have focal depths greater than 300 km are commonly termed “deep-focus” earthquakes. Deep-focus earthquakes cause less damage on the ground surface above their foci than similar-magnitude shallow-focus earthquakes, but large deep-focus earthquakes may be felt at great distance from their epicenters.

 

The earthquake was recorded at seismic stations worldwide, including stations of the Irish National Seismic Network (INSN), see seismic waveforms below (select figure to enlarge).

2018-08-05, M6.9, Indonesia

On 5th August, 2018, an earthquake measuring magnitude 6.9 occured in the Lombok Region, Indonesia at 18:46 local time. Latest media reports that at least 91 people have been killed, many more have been injured and thousands of houses have been destroyed or damaged throughout the region. It hit just a few days after shallow M6.4 on July 28 in which 17 people died.

The earthquake was recorded at seismic stations worldwide, including stations of the Irish National Seismic Network (INSN), see seismic waveforms below (select figure to enlarge).

2018-02-25, M7.5 Papua New Guinea

On 25th February, 2018, an earthquake measuring magnitude 7.5 occurred at 4a.m local time, in a rural, jungle area of the Southern Highlands in New Guinea, Papaua New Guinea. It wasn’t immediately clear if there was damage. No tsunami watches or warnings were issued because of the quake.

At the location of this earthquake, the Australia plate is converging with the Pacific plate and it occurred as the result of thrust faulting at shallow a depth. Thrust-faulting events of the size of the February 25th, 2018 earthquake are typically about 85×30 km (length x width).

dias2018dxvu-map-no_stations-40deg

The earthquake was recorded at seismic stations worldwide, including stations of the Irish National Seismic Network (INSN), see seismic waveforms below (select figure to enlarge).

7-5_2018-02-25_056_174444-200_-6-08_142-79_35_4200_-720_0-01-none-1-none

2018-02-16, M7.2 Mexico

A magnitude 7.2 earthquake occurred in the Oaxaca region in southern Mexico on the 16th February 2018 at 23:39:39 UTC at a depth of about 25km. The epicentre lies onshore about 150km from the Pacific coast, see map below. About 50 homes were damaged and nearly 1 million homes were left without electricity. While no fatalaties related directly to the event have been reported two government officials died when a helicopter surveying damage crashed.

dias2018dhvz-map-no_stations-20degFurther information is available from the following webpages:

EMSC: https://www.emsc-csem.org/Earthquake/earthquake.php?id=648846
GFZ: http://geofon.gfz-potsdam.de/eqinfo/event.php?id=gfz2018dhvz
USGS: https://earthquake.usgs.gov/earthquakes/eventpage/us2000d3km#executive

More information about the INSN is available via this link.

2018-02-06, M6.4 Taiwan

On 6th February, 2018, an earthquake measuring magnitude 6.4 occurred northeast of Hualien, Taiwan. So far at least seven people have been killed and more than 250 injuries have been reported. Aftershocks continue to occur in Taiwan since the earthquake.

Taiwan lies in a region of complex tectonics near the intersection of three major tectonic plates – the Philippine Sea plate to the east and southeast, the Eurasia plate to the north and west, and the Sunda plate to the southwest. The February 6th 2018 earthquake is the largest in a sequence of events in the same region over the past several days. Because of its plate boundary location, Taiwan commonly experiences moderate-to-large earthquakes.

dias2018cozm-map-no_stations-12deg

The earthquake was recorded at seismic stations worldwide, including stations of the Irish National Seismic Network (INSN), see seismic waveforms below (select figure to enlarge).

2018-01-23, M8.0 Gulf of Alaska

A major earthquake with magnitude 8.0 occurred in the Gulf of Alaska on the 23rd January 2018 at 09:31:41 UTC at a depth of about 25km. A tsunami warning was issued but has been cancelled. The Aleutian arc extends approximately 3,000 km from the Gulf of Alaska in the east to the Kamchatka Peninsula in the west. It marks the region where the Pacific plate subducts into the mantle beneath the North America plate. This subduction is responsible for the generation of the Aleutian Islands and the deep offshore Aleutian Trench. The Aleutian arc is a seismically active region, evidenced by the many moderate to large earthquakes occurring each year.

The earthquake was recorded at seismic stations worldwide, including stations of the Irish National Seismic Network (INSN), see seismic waveforms below (select figure to enlarge).

Further information is available from the following webpages:

EMSC: https://www.emsc-csem.org/Earthquake/earthquake.php?id=642932
GFZ: https://geofon.gfz-potsdam.de/eqinfo/event.php?id=gfz2018boxy
USGS: https://earthquake.usgs.gov/earthquakes/eventpage/us2000cmy3#origin

More information about the INSN is available via this link.

2018-01-14, M7.2 Peru

A major earthquake with magnitude 7.2 occurred off the southern coast of Peru on the 14th January 2018 at 09:18:46 UTC at a depth of about 40km. The epicenter of this event lies about 30km from the coast of the Arequipa region, see map below. Tens of people have been injured and at least one fatality has been reported. No tsunami has been observed following this earthquake. Strong earthquakes are not uncommon in this region where the Nazca plate subducts beneath the South America plate at about 7 centimeters per year.

dias2018ayma-map-no_stations-30deg

The earthquake was recorded at seismic stations worldwide, including stations of the Irish National Seismic Network (INSN), see seismic waveforms below (select figure to enlarge).

7-2_2018-01-14_014_09_18_45-0_15-73_-74-61_41_5400_0_0-01-none-1-none

Further information is available from the following webpages:

EMSC: https://www.emsc-csem.org/Earthquake/earthquake.php?id=641183
GFZ: http://geofon.gfz-potsdam.de/eqinfo/event.php?id=gfz2018aylz
USGS: https://earthquake.usgs.gov/earthquakes/eventpage/us2000cjfy#executive

More information about the INSN is available via this link.

2018-01-10, M7.6 Honduras

A strong earthquake of magnitude 7.6 occurred on the 10th January 2018 at 02:51:32.1 UTC in the Caribbean Sea, about 200km from the northern coast of Honduras, see map below. A tsunami alert was first issued but has been lifted since. The event is due to movement on the North America-Caribbean plate boundary and was felt in Honduras, Guatemala, Costa Rica, El Salvador and some parts of Mexico. There are no reports of injuries or structural damage. dias2018aqre-map-no_stations-20deg

The earthquake was recorded at seismic stations worldwide, including stations of the Irish National Seismic Network (INSN), see seismic waveforms below (select figure to enlarge).

7-5_2018-01-10_010_025132-100_17-38_-83-5_12_5400_0_0-01-none-1-none

Further information is available from the following webpages:

EMSC: https://www.emsc-csem.org/Earthquake/earthquake.php?id=640330
GFZ: https://geofon.gfz-potsdam.de/eqinfo/event.php?id=gfz2018aqre
USGS: https://earthquake.usgs.gov/earthquakes/eventpage/us1000c2zy#executive

More information about the INSN is available via this link.

2017-11-12, M7.3 Iran

A magnitude 7.3 earthquake occurred on the 12th November 2017 at 18:18 UTC in the northwest of Iran at a depth of about 23 km. The epicentre location is close to the border with Iraq, 209 km northeast of Baghdad. At least 330 fatalities have been reported to date and thousands of people have been injured. The earthquake rupture is related to plate convergence between the Arabia and the Eurasia plate and strong damaging earthquakes in the region are not uncommon. The most damaging event in recent times was a magnitude 7.4 earthquake in June 1990 in the Rasht-Qazvin-Zanjan area. That event  caused 40,000 to 50,000 fatalities and left over 600,000 people homeless.

dias2017wexs-map-no_stations-20deg

The 12th November 2017 earthquake was recorded at seismic stations worldwide, including stations of the Irish National Seismic Network (INSN), see seismic waveforms below (select figure to enlarge).

Further information is available from the following webpages:

More information about the INSN is available via this link.

2017-09-19, M7.1 Mexico

An earthquake with magnitude 7.1 occurred near Puebla, about 120km from Mexico City on the 19th September 2017 at  18:14:38 UTC. A number of buildings in Mexico City collapsed and at least 200 fatalities have been reported to date. The event happened on the 32nd anniversary of the devastating magnitude 8.1 Mexico City earthquake.

The earthquake was recorded at seismic stations worldwide, including stations of the Irish National Seismic Network (INSN), see seismic waveforms below (select figure to enlarge).

7-1_2017-09-19_262_181439-0_18-584_-98-399_51_3600_-450_0-01-none-1-none

 

Further information is available from the following webpages:

EMSC: https://www.emsc-csem.org/Earthquake/earthquake.php?id=619258
GFZ: http://geofon.gfz-potsdam.de/eqinfo/special/gfz2017skgl/
USGS: https://earthquake.usgs.gov/earthquakes/eventpage/us2000ar20#executive
More information about the INSN is available via this link.

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