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Kobe earthquake

earth science Maturity 7-9 Next article →

The Kobe earthquake, also known as the Great Hanshin earthquake, was a massive seismic event. It occurred on January 17, 1995, at 05:46:53 JST. The earthquake struck the southern part of Hyōgo Prefecture in Japan. It specifically impacted the Hanshin region. This event was a major disaster for the nation. It was Japan's second deadliest earthquake of the 20th century. Only the 1923 Great Kantō earthquake resulted in more deaths.

Carte-seisme-kobe
Carte-seisme-kobe

This event was classified as an inland shallow earthquake. Most large Japanese earthquakes come from the subduction of the Philippine Sea or Pacific plates. Those occur in coastal regions of northeastern Japan. However, this earthquake happened along active faults near the surface. The hypocenter, or the point where the earthquake begins underground, was 17 km deep. This is less than the 20 km threshold for shallow earthquakes. The epicenter was located on the northern end of Awaji Island. This was only 20 km away from the city center of Kobe.

兵庫県南部地震 震度7の地域
兵庫県南部地震 震度7の地域

The earthquake was driven by a strike-slip mechanism. This mechanism accommodated east–west shortening of the Eurasian plate. This shortening happened because the plate collided with the Philippine Sea plate. The movement spread along several specific fault lines. It moved along the Nojima Fault on Awaji Island. It also moved along the Suma and Suwayama faults through Kobe. During the 20 seconds of shaking, the Nojima Fault shifted significantly. The south side moved 1.5 meters to the right. It also moved 1.2 meters downwards. Four foreshocks occurred before the main event. The largest foreshock was a magnitude 3.7 event.

1995-1-17 Hanshin-Awaji earthquake 1995,Hankyu Sannomiya
1995-1-17 Hanshin-Awaji earthquake 1995,Hankyu Sannomiya

Measuring the power of the earthquake revealed its extreme intensity. It measured 6.9 on the moment magnitude scale. It also reached a maximum intensity of 7 on the JMA Seismic Intensity Scale. This was the first time Japan officially recorded a Level 7 intensity.

1995-1-17 Hanshin-Awaji earthquake 1995,Hankyu Sannomiya
1995-1-17 Hanshin-Awaji earthquake 1995,Hankyu Sannomiya

High intensity was felt in northern Awaji Island and several cities. These included Kobe, Ashiya, Nishinomiya, and Takarazuka. Other regions like Kansai and Chūgoku felt intensities between 4 and 6. Following this event, Japan fully mechanized its seismic intensity observations in 1996. The JMA also divided intensity levels 5 and 6 into two sub-levels.

1995-1-17 Hanshin-Awaji earthquake 1995,Hankyu Sannomiya
1995-1-17 Hanshin-Awaji earthquake 1995,Hankyu Sannomiya

The physical destruction was widespread and severe. At least 5,000 people died, with about 4,600 of those deaths in Kobe. Nearly 400,000 buildings suffered irreparable damage. In some areas, one in five buildings was destroyed or uninhabitable.

Hanshin-Awaji earthquake 1995 343
Hanshin-Awaji earthquake 1995 343

Many traditional houses experienced a pancake collapse. These homes had heavy tile roofs weighing up to two tons. The light wooden frames could not support the weight when the shaking started. The roofs then crushed the walls and floors. Additionally, approximately 300 fires broke out across the city. Artificial islands like Port Island also suffered from liquefaction. This process forced water up through the soil, making the ground unstable.

Transportation and infrastructure also faced massive failures. Ten spans of the Kobe Route elevated expressway collapsed. This blocked a road that carried 40% of traffic between Osaka and Kobe. Only 30% of the Osaka-Kobe railway tracks remained operational initially. The Sanyo Shinkansen high-speed rail line had to shut down completely. This happened because wooden supports inside concrete pilings collapsed. The port of Kobe was also heavily hit. About 120 of its 150 quays were damaged. This was a major blow to the global economy. Kobe was one of the world's sixth-largest container ports.

Hanshin-Awaji earthquake 1995 337
Hanshin-Awaji earthquake 1995 337

Despite the tragedy, the region showed incredible resilience. The local economy recovered very quickly after the disaster. Within 15 months, manufacturing activity reached 98% of pre-quake levels. Import volumes through the port recovered fully within one year.

This event also changed Japanese society. It became a turning point for volunteerism in Japan. Many people from across the country traveled to Kobe to help. The government later declared January 17 as National Disaster Prevention and Volunteerism Day. This ensures that the lessons of 1995 are never forgotten.

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🖼️ Images & Media (7)
File:Carte-seisme-kobe.png
Carte-seisme-kobe.png
File:兵庫県南部地震_震度7の地域.png
兵庫県南部地震_震度7の地域.png
File:Hanshin-Awaji earthquake 1995 343.jpg
Hanshin-Awaji earthquake 1995 343.jpg
File:1995-1-17 Hanshin-Awaji earthquake 1995,Hankyu Sannomiya.jpg
1995-1-17 Hanshin-Awaji earthquake...
File:Hanshin-Awaji earthquake 1995 337.jpg
Hanshin-Awaji earthquake 1995 337.jpg
File:Fire char kobe 2005.0117.jpg
Fire char kobe 2005.0117.jpg
File:Japan Trip (2271).jpg
Japan Trip (2271).jpg
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