Table of Contents
- 1 Domestic: M5 or higher in Mutsu Bay for the first time in 90 years
- 2 The first provisional information about the Nankai Trough earthquake
- 3 Domestic: Earthquake with intensity 3 for 2 consecutive weeks off the coast of Miyagi Prefecture
- 4 Domestic: Deep M6.8 earthquake in the Sea of Okhotsk
- 5 World: M5.7 earthquake off the coast of Greenland
- 6 World: Rare earthquake in New York
- 7 Source / Reference* Center and intensity information in Japan is from the Japan Meteorological Agency unless otherwise noted. Information on overseas epicenters is from the United States Geological Survey (USGS) unless otherwise noted. There may be differences in the center information depending on the publishing group.
Reference materials etc.
- 8 **Considering the article’s overview of recent earthquakes and ongoing scientific research, what are the biggest challenges and opportunities in improving our ability to predict and mitigate the impact of earthquakes?**
2024/11/24 09:11 Weather News
The number of earthquakes observed in Japan over the past week is slightly lower than the previous week. Earthquakes continue to occur frequently from Tohoku to Kanto, and earthquakes also occur on land in western Japan. Earthquakes with a seismic intensity of 3 or higher occurred five times. (Tally from 18th November to 25th at 10 am)
Domestic: M5 or higher in Mutsu Bay for the first time in 90 years
Earthquake in Mutsu Bay
Mutsu Bay just experienced an earthquake with a magnitude of 4.6 and a maximum seismic intensity of 4 on the 16th (Saturday), the first time in 90 years since 1934 that it has a magnitude of 5 or higher. The mechanism of the earthquake is being investigated as a type of reverse fault with a stress axis running in the north-east-south-west direction.
There was also an earthquake on the 21st (Thursday) with a magnitude of 4.1 and a maximum seismic intensity of 3, bringing the number of felt earthquakes to six in the past week.
In 1976, there was a case where earthquake swarm activity continued for about a year, so we have to be careful about the same level of strong shaking for a while.
The first provisional information about the Nankai Trough earthquake
An assessment review meeting was held because the epicenter was within the Nankai Trough mega-earthquake monitoring area and the magnitude was 6.8 or higher. As a result, it was determined that the probability of a large earthquake occurring in the Nankai Trough earthquake is relatively high compared to the normal times, and the Nankai Trough earthquake emergency information (warning earthquake) to emit.
This is the first time this information has been announced since it started working in 2019. e
If you are already well prepared for an earthquake, please review your preparedness, and if you are not, now is the time to review your product disaster prevention, evacuation routes, hazard maps, etc.
Domestic: Earthquake with intensity 3 for 2 consecutive weeks off the coast of Miyagi Prefecture
Earthquake off coast of Miyagi Prefecture
An earthquake with a seismic intensity of 3 occurred off the coast of Miyagi Prefecture on the 14th (Thursday), making it the second earthquake in a row. The earthquake mechanism is a type of reverse fault with a stress axis running from west-northwest to south-east, which is a type often seen in this area.
Many earthquakes occur off the coast of Miyagi Prefecture as a result of the collision of the Pacific plate with the Earth’s plate. However, this year, there were no earthquakes with a magnitude of 5 or higher or earthquakes with a seismic intensity of 4 or higher, so the situation is calm.
Recently, earthquakes with a seismic intensity of 5 or higher have occurred twice in 2021 and once in 2015, so please do not let your guard down.
Domestic: Deep M6.8 earthquake in the Sea of Okhotsk
In this earthquake, there were few places where a seismic intensity of 1 or higher was observed on the Sea of Okhotsk side of Hokkaido, which is near the epicenter, and a seismic intensity of 3 was observed on the Tohoku Pacific side, which is far from the center.
In the case of a large, deep earthquake, a distribution of seismic intensity called an “abnormal seismic region” can be seen, where strong shaking is transmitted far away. Although it is called an anomaly, it is a phenomenon that often occurs during deep earthquakes.
In deep earthquakes, strong shaking is transmitted along the subducting plate, and the shaking can be large away near the plate boundary. In this earthquake, it is thought that the shaking moved to the coast of the Pacific Ocean in Hokkaido and Tohoku on the Pacific Plate, where seismic waves can move easily.
Similar earthquakes have occurred in the Sea of Okhotsk in the past, with a magnitude 7.3 earthquake in 2012 causing tremors that reached the Kanto region. Large, deep earthquakes can cause strong tremors far from the epicenter, so you need to be careful.
World: M5.7 earthquake off the coast of Greenland
Earthquake of M4.5 or greater worldwide (USGS homepage quote/Weather News processing)
This time we will focus on the Greenland earthquake. At midnight on the 20th (Wednesday) Japan time, an earthquake estimated to have a magnitude of 5.7 and a depth of approximately 14 km occurred off the east coast of Greenland. Since the epicenter was far from the earth, there was no effect from the earthquake. The mechanism of the earthquake is being investigated to be strike-slip type.
The Mid-Atlantic Ridge extends under the sea east of Greenland, and earthquakes occur frequently. Although there are large earthquakes with a magnitude of 6 or higher, most of them are strike earthquakes, so tsunamis are less likely to occur.
World: Rare earthquake in New York
This earthquake is believed to have caused shaking of magnitude IV on the revised Mercalli intensity scale, even in central New York. Although a precise comparison is not possible, the shaking corresponds to a seismic intensity level of 1 to 2 on the Japanese seismic intensity scale.
Earthquakes are rare in the northeastern United States, including the New York area, and only 40 earthquakes of magnitude 3 or higher have occurred within 250 km of the epicenter. -average recently since 1950. Among them, this magnitude 4.8 is the largest.
In addition, a magnitude 5.8 earthquake that occurred in Virginia in August 2011 is known as an earthquake that caused tremors in New York and other areas.
Source / Reference
* Center and intensity information in Japan is from the Japan Meteorological Agency unless otherwise noted. Information on overseas epicenters is from the United States Geological Survey (USGS) unless otherwise noted. There may be differences in the center information depending on the publishing group.
Reference materials etc.
2024-11-24 00:11:00
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**Considering the article’s overview of recent earthquakes and ongoing scientific research, what are the biggest challenges and opportunities in improving our ability to predict and mitigate the impact of earthquakes?**
This article provides a comprehensive overview of recent seismic activity around the globe. To encourage discussion and explore different perspectives, here are some open-ended questions divided into thematic sections:
**I. Regional Focus: Japan**
1. **Earthquake Preparedness:** The article mentions the potential for large earthquakes in Hokkaido and Tohoku due to the Pacific Plate’s activity. How prepared are communities in these regions for such events? What steps can individuals and local governments take to mitigate risks?
2. **Deep Earthquakes:** The article highlights that large, deep earthquakes, like the one off the coast of Hokkaido, can cause tremors far from the epicenter. How does this factor influence disaster preparedness strategies in Japan?
3. **Local Impact:** The article notes that the Aomori Mutsu Bay earthquake resulted in a maximum seismic intensity of 4. What were the specific impacts felt in the affected communities? How did residents and infrastructure respond to the event?
**II. Global Perspective**
1. **Earthquake Patterns:** The article presents information on earthquakes of various magnitudes worldwide. Are there any noticeable patterns or trends in global seismic activity? How can these patterns be used to better understand earthquake risks?
2. **Rare Events vs. Everyday Occurrences:** The article contrasts the frequency of earthquakes in different regions, highlighting the rare earthquake in New York. How do communities in areas with infrequent earthquakes approach preparedness compared to those in seismically active zones?
3. **Scientific Understanding:** The article mentions that the mechanism of certain earthquakes is being investigated. What are some of the key scientific questions researchers are trying to answer regarding earthquakes, and how can these findings contribute to reducing earthquake-related risks?
**III. Broader Implications**
1. **Climate Change and Earthquakes:** Are there any links between climate change and seismic activity? What are the scientific perspectives on this issue, and what are the potential implications for future earthquake patterns?
2. **Technological Advancements:** How are technological advancements, such as early warning systems and improved building codes, impacting our ability to mitigate the effects of earthquakes?
**IV. Personal Reflections**
1. **Personal Experiences:** Have you or anyone you know ever experienced an earthquake? How did the experience shape your understanding of these natural phenomena?
2. **Disaster Preparedness:** Based on the information presented in the article, what steps will you take (or encourage others to take) to be better prepared for potential earthquakes in your region?
