Japan Quake Anniversary: Experts Warn of 9.0 Magnitude Earthquake, 20m Tsunami
Tokyo (AP) — On the 14th anniversary of the March 11 earthquake, research indicates a high probability of a major earthquake in the Kuril-Kamchatka Trench.
Northeastern University and hokkaido University released a report ahead of the anniversary of the 3.11 Great East Japan Earthquake,
according to Japan Broadcasting Corporation (NHK). The report indicates that the Kuril-Kamchatka Trench, located off the southeastern coast of Hokkaido, has accumulated energy sufficient to trigger a massive earthquake.
The research team suggests that the accumulated energy could unleash a magnitude 9.0 earthquake, urging preparedness for earthquakes and tsunamis. Japan’s Earthquake Research Committee also forecasts a 7% to 40% probability of a magnitude 8.8 or greater earthquake occurring in the area within the next 30 years.
17th Century Earthquake: Area in Period of Potential Recurrence
Table of Contents
- Understanding the Earthquake Threat in the Kuril-Kamchatka Trench: A Q&A Guide
- What is the Kuril-Kamchatka Trench and why is it crucial?
- What is the probability of a major earthquake in the Kuril-Kamchatka Trench?
- When was the last major earthquake in the Kuril-Kamchatka Trench?
- How often do major earthquakes occur in the Kuril-Kamchatka Trench?
- What magnitude earthquake could perhaps occur in the Kuril-Kamchatka Trench?
- How is the energy accumulation in the Kuril-Kamchatka Trench being monitored?
- What are the potential consequences of a major earthquake in the Kuril-Kamchatka Trench?
- What kind of preparedness measures are being recommended?
- Key Earthquake Facts:
The last mega-thrust earthquake
in the Kuril-Kamchatka Trench occurred between 1611 and 1637, causing a tsunami that pushed the coastline of southeastern Hokkaido inland by 1 to 4 kilometers, according to past research by a government committee. The research also indicated that similar mega-thrust earthquakes occur on average every 330 to 590 years, raising concerns about a potential future earthquake in the kuril-Kamchatka Trench.
As 2019,a research team from Tohoku University,Hokkaido University,and the Japan Agency for Marine-Earth Science and Technology (JAMSTEC) has conducted a five-year seabed survey using GPS observation points to accurately understand crustal deformation at the boundary between the landward and seaward plates.
The survey results show that observation points on the seaward plate move approximately 8 centimeters per year toward the landward plate. Observation points at the location where the seaward plate begins to subduct also move approximately 8 centimeters per year toward the landward plate, indicating ongoing subduction. At the subduction zone, the plates are strongly coupled, leading to continuous energy accumulation.
Understanding the Earthquake Threat in the Kuril-Kamchatka Trench: A Q&A Guide
What is the Kuril-Kamchatka Trench and why is it crucial?
The Kuril-Kamchatka Trench is a deep-sea trench located in the northwest Pacific Ocean, off the southeastern coast of Hokkaido, Japan, and extending along the Kuril Islands and Kamchatka Peninsula. It’s a subduction zone where the Pacific plate is forced beneath the Okhotsk plate. This process of subduction leads to meaningful energy accumulation, making the region prone to large earthquakes and tsunamis.
What is the probability of a major earthquake in the Kuril-Kamchatka Trench?
According to Japan’s Earthquake Research committee and other research teams, ther is a 7% to 40% probability of a magnitude 8.8 or greater earthquake occurring in the Kuril-Kamchatka Trench within the next 30 years (as of 2021). The average recurrence interval is estimated to be 340 to 380 years.
When was the last major earthquake in the Kuril-Kamchatka Trench?
The last mega-thrust earthquake in the Kuril-Kamchatka Trench occurred between 1611 and 1637. This event triggered a massive tsunami that inundated the southeastern coast of hokkaido, pushing the coastline inland by 1 to 4 kilometers.
How often do major earthquakes occur in the Kuril-Kamchatka Trench?
Research indicates that similar mega-thrust earthquakes occur in the Kuril-Kamchatka Trench on average every 330 to 590 years.
What magnitude earthquake could perhaps occur in the Kuril-Kamchatka Trench?
Research suggests the accumulated energy in the Kuril-Kamchatka Trench could unleash a magnitude 9.0 earthquake.
How is the energy accumulation in the Kuril-Kamchatka Trench being monitored?
Since 2019, a research team from several Japanese universities and JAMSTEC has been conducting a five-year seabed survey using GPS observation points. The goal is to accurately understand crustal deformation at the boundary between the landward and seaward plates. The survey results show that observation points on the seaward plate move approximately 8 centimeters per year toward the landward plate, indicating ongoing subduction and energy accumulation.
What are the potential consequences of a major earthquake in the Kuril-Kamchatka Trench?
A major earthquake in the Kuril-Kamchatka Trench could cause:
Strong ground shaking: Affecting Hokkaido and potentially other areas in Japan and the Russian Far East.
Devastating tsunamis: Similar to the 17th-century event, which could cause widespread inundation and damage to coastal communities.
Infrastructure damage: Disruption of essential services, transportation, and interaction networks.
What kind of preparedness measures are being recommended?
Considering the potential earthquake threat, authorities and research teams are urging preparedness for both earthquakes and tsunamis. This includes:
Strengthening infrastructure: To withstand strong ground shaking.
Developing and practicing evacuation plans: For coastal communities at risk of tsunamis.
Improving early warning systems: To provide timely alerts to the public.
* Public education: To raise awareness about earthquake and tsunami hazards and preparedness measures.
Key Earthquake Facts:
| Feature | Description |
| ———————— | —————————————————————————————————————— |
| Location | Kuril-Kamchatka Trench, Northwest Pacific Ocean |
| Potential Magnitude | Up to 9.0 |
| Probability (next 30yrs) | 7-40% for Magnitude 8.8+ (as of 2021) |
| Last Major Earthquake | 1611-1637 |
| Recurrence Interval | Every 330-590 years |
| Monitoring | Seabed GPS surveys by Tohoku University, Hokkaido university, and JAMSTEC to monitor plate movement and energy accumulation. |