Great Hanshin earthquake

The Great Hanshin earthquake (阪神・淡路大震災, Hanshin Awaji daishinsai), or Kobe earthquake, occurred on January 17, 1995 at 05:46:53 JST (January 16 at 20:46:53 UTC) in the southern part of Hyōgo Prefecture, Japan, including the region known as Hanshin. It measured 6.9 on the moment magnitude scale and had a maximum intensity of 7 on the JMA Seismic Intensity Scale (X on the Modified Mercalli Intensity Scale).[4] The tremors lasted for approximately 20 seconds. The focus of the earthquake was located 17 km beneath its epicenter, on the northern end of Awaji Island, 20 km away from the center of the city of Kobe.

Great Hanshin earthquake
Tokyo
Kobe
UTC time1995-01-16 20:46:53
ISC event124708
USGS-ANSSComCat
Local dateJanuary 17, 1995 (1995-01-17)
Local time05:46:53 JST
Duration~20 seconds
Magnitude6.9 Mw[1]
Depth17.6 km (10.9 mi)[1]
Epicenter34.59°N 135.07°E / 34.59; 135.07[1]
FaultNojima
TypeStrike-slip[2]
Areas affectedJapan
Total damage$200 billion USD[3]
Max. intensityX (Extreme)
Shindo 7
Peak acceleration0.8 g
Casualties5,502–6,434 killed[2]
36,896–43,792 injured[2]
251,301–310,000 displaced[2]

Up to 6,434 people lost their lives; about 4,600 of them were from Kobe.[5] Among major cities, Kobe, with its population of 1.5 million, was the closest to the epicenter and hit by the strongest tremors. This was Japan's worst earthquake in the 20th century after the Great Kantō earthquake in 1923, which claimed more than 105,000 lives.

Earthquake
Damage at Minatogawa, Kobe

Most of the largest earthquakes in Japan are caused by subduction of the Philippine Sea Plate or Pacific Plate, with mechanisms that involve either energy released within the subducting plate or the accumulation and sudden release of stress in the overlying plate. Earthquakes of these types are especially frequent in the coastal regions of northeastern Japan.[6]

The Great Hanshin earthquake belonged to a third type, called an "inland shallow earthquake".[7] Earthquakes of this type occur along active faults. Even at lower magnitudes, they can be very destructive because they often occur near populated areas and because their hypocenters are located less than 20 km below the surface. The Great Hanshin earthquake began north of the island of Awaji, which lies just south of Kobe. It spread toward the southwest along the Nojima Fault on Awaji and toward the northeast along the Suma and Suwayama faults, which run through the center of Kobe.[8] Observations of deformations in these faults suggest that the area was subjected to east–west compression, which is consistent with previously known crustal movements.[9] Like other earthquakes recorded in western Japan between 1891 and 1948, the 1995 earthquake had a strike-slip mechanism that accommodated east–west shortening of the Eurasian Plate due to its collision with the Philippine Sea Plate in central Honshu.[10]

The Mj 7.3 earthquake struck at 05:46 JST on the morning of January 17, 1995. It lasted for 20 seconds. During this time the south side of the Nojima Fault moved 1.5 meters to the right and 1.2 meters downwards. There were four foreshocks, beginning with the largest (Mj 3.7) at 18:28 on the previous day.

Intensity
USGS ShakeMap for the event

It was the first time that an earthquake in Japan was officially measured at a seismic intensity (shindo in Japanese) of the highest Level 7 on the scale of Japan Meteorological Agency (JMA). After the earthquake, seismic intensity observation in Japan was fully mechanized (from April 1996) and JMA seismic intensity Levels 5 and 6 were each divided into 2 levels (from October 1996).

An on-the spot investigation by JMA concluded that tremors by this earthquake were at seismic intensity of Level 7 in particular areas in northern Awaji Island (now Awaji City) and in the cities of Kobe, Ashiya, Nishinomiya and Takarazuka.[11]

Tremors were valued at seismic intensity of Levels 4 to 6 at observation points in Kansai, Chūgoku, Shikoku and Chūbu regions:[11]

Damage

Damage was extremely widespread and severe. Structures irreparably damaged by the quake included nearly 400,000 buildings,[3][12] numerous elevated road and rail bridges, and 120 of the 150 quays in the port of Kobe. The quake triggered around 300 fires,[3] which raged over large portions of the city.[13] Disruptions of water, electricity and gas supplies were extremely common. In addition, residents were afraid to return home because of aftershocks that lasted several days (74 of which were strong enough to be felt).

The majority of deaths, over 4,000, occurred in cities and suburbs in Hyōgo Prefecture. A total of 68 children under the age of 18 were orphaned, while 332 additional children lost one parent.[14]

A section of the Nojima Fault (left) and preserved damage at the Earthquake Memorial Park near the port of Kobe

One in five of the buildings in the worst-hit areas were completely destroyed (or rendered uninhabitable). About 22% of the offices in Kobe's central business district were rendered unusable, and over half of the houses in that area were deemed unfit to live in. High rise buildings that were built after the modern 1981 building code suffered little; however, those that were not constructed to these standards suffered serious structural damage. Most of the older traditional houses had heavy tiled roofs which weighed around two tons, intended to resist the frequent typhoons that plagued Kobe, but they were only held up by a light wood support frame. When the wood supports gave way, the roof crushed the unreinforced walls and floors in a pancake collapse. Newer homes have reinforced walls and lighter roofs to avoid this, but are more susceptible to typhoons.

The damage to highways and subways was the most graphic image of the earthquake, and images of the collapsed elevated Kobe Route of the Hanshin Expressway made front pages of newspapers worldwide. Most people in Japan believed those structures to be relatively safe from earthquake damage because of the steel-reinforced concrete design. Although the initial belief was construction had been negligent, it was later shown that most of the collapsed structures were constructed properly according to the building codes in force in the 1960s. However, the steel-reinforcement specifications in the 1960s regulations had already been discovered to be inadequate and revised several times, the latest revision being in 1981, which proved effective but only applied to new structures.

Immediately before the collapse of the Kashiwai building

Ten spans of the Kobe Route elevated expressway were knocked over in three locations across Kobe and Nishinomiya, blocking a link that carried forty percent of Osaka-Kobe road traffic. Half of the elevated expressway's piers were damaged in some way, and the entire route was not reopened until September 30, 1996. Three bridges on the less heavily used Route 2 were damaged, but the highway was reopened well ahead of Route 3 and served as one of the main intercity road links for a time. The Meishin Expressway was only lightly damaged, but was closed during the day until February 17, 1995 so that emergency vehicles could easily access the hardest-hit areas to the west. It wasn't until July 29 that all four lanes were open to traffic along one section.[15] Many surface highways were clogged for some time due to the collapse of higher-capacity elevated highways.

Most railways in the region were also damaged. In the aftermath of the earthquake, only 30% of the Osaka-Kobe railway tracks were operational. Daikai Station on the Kobe Rapid Railway line collapsed, bringing down part of National Route 28 above it. Wooden supports collapsed inside supposedly solid concrete pilings under the tracks of the Shinkansen high-speed rail line, causing the entire line to shut down. However, the railways rebounded quickly after the quake, reaching 80% operability in one month. The Kobe Municipal Subway resumed operation the day after the earthquake with limited service between Seishin-Chuo and Itayado stations (along with the Hokushin Kyuko Electric Railway between Tanigami and Shin-Kobe); service resumed across the entire line on February 16, 1995, with full service resuming a month later after repairs were completed. Trains continued to operate with speed restrictions until July 21, 1995.

Artificial islands, such as the modern Rokkō Island and especially Port Island in Kobe, suffered severe subsidence due to liquefaction of the soil; water breaking through the surface and flooding those islands was initially believed to have seeped in from the sea, but in fact rose from the liquefied remains of once-solid soils used to construct the islands. However, the newly completed artificial island supporting Kansai International Airport was not significantly affected, due to being further away from the epicenter and because it was built to the latest standards. The Akashi Kaikyō Bridge, under construction near the earthquake's epicenter, was not damaged but was reportedly lengthened by a full meter due to horizontal displacement along the activated tectonic fault.

Nomenclature

Outside Japan the earthquake is commonly known as the Kobe earthquake. In Japan, the disaster by this earthquake is officially called The Great Hanshin-Awaji Earthquake Disaster (阪神・淡路大震災, Hanshin-Awaji Daishinsai), which is often shortened to The Great Hanshin Earthquake Disaster (阪神大震災, Hanshin Daishinsai). Hanshin refers to the region between Osaka and Kobe. In the scientific literature it is often called the 1995 Southern Hyōgo Prefecture Earthquake (平成7年(1995年)兵庫県南部地震, Heisei 7 nen (1995 nen) Hyōgo-ken Nanbu Jishin), the name chosen by the Japan Meteorological Agency in the week after the main shock.

Other aspects
Damage in Sannomiya

The quake ravaged many of the facilities of what was then the world's sixth-largest container port and the source of nearly 40% of Kobe's industrial output.[16]

The sheer size of the earthquake caused a major decline in Japanese stock markets, with the Nikkei 225 index plunging by 1,025 points on the day following the quake. This financial damage was the immediate cause for the collapse of Barings Bank due to the actions of Nick Leeson, who had speculated vast amounts of money on Japanese and Singaporean derivatives. Discussions of Japan's "Lost Decade" tend towards purely economic analysis, and neglect the impact of the earthquake on the Japanese economy which at the time was already suffering from recession.

Despite this devastation in a big production center, the local economy recovered very quickly.[16] Even though less than half the port facilities had been rebuilt by that stage, within a year import volumes through the port had recovered fully and export volumes were nearly back to where they would have been without the disaster.[16] Less than 15 months after the earthquake, in March 1996, manufacturing activity in greater Kobe was at 98% of its projected pre-quake level.[16]

Volunteerism

The fact that volunteers from all over Japan converged on Kobe to help victims of the quake was an important event in the history of volunteerism in Japan. The year 1995 is often regarded as a turning point in the emergence of volunteerism as a major form of civic engagement.

In December 1995, the government declared January 17 a national "Disaster Prevention and Volunteerism Day", and the week from January 15 to 21 a national "Disaster Prevention and Volunteerism Week", to be commemorated with lectures, seminars, and other events designed to encourage voluntary disaster preparedness and relief efforts.[17]

Disaster planning

The earthquake proved to be a major wake-up call for Japanese disaster prevention authorities. Japan installed rubber blocks under bridges to absorb the shock and rebuilt buildings further apart to prevent collateral damage. The national government changed its disaster response policies in the wake of the earthquake, and its response to the 2004 Chūetsu earthquake was significantly faster and more effective. The Ground Self-Defense Forces were given automatic authority to respond to earthquakes over a certain magnitude, which allowed them to deploy to the Niigata region within minutes. Control over fire response was likewise handed over from local fire departments to a central command base in Tokyo and Kyoto.[18]

1.17 memorial in Kobe in January 2005, ten years later

In response to the widespread damage to transportation infrastructure, and the resulting effect on emergency response times in the disaster area, the Ministry of Land, Infrastructure and Transport began designating special disaster prevention routes and reinforcing the roads and surrounding buildings so as to keep them as intact as possible in the event of another earthquake.[19] Hyōgo's prefectural government invested millions of yen in the following years to build earthquake-proof shelters and supplies in public parks.[20]

Memorials

The Kobe Luminarie is an event held for approximately two weeks every December. A street leading from the Daimaru store in Motomachi to Higashi Yuenchi Park (next to Kobe city hall) is decorated with arches of multicoloured lights that were donated by the Italian government. Amongst the commemorative events held on the anniversary of the earthquake, large "1.17" digits are illuminated in Higashi Yuenchi Park in the early hours of January 17 each year.

Response
Local memorial in Kobe. "We won't forget that time"

Approximately 1.2 million volunteers were involved in relief efforts during the first three months following the earthquake. Retailers such as Daiei and 7-Eleven used their existing supply networks to provide necessities in affected areas, while NTT and Motorola provided free telephone service for victims. Even the Yamaguchi-gumi yakuza syndicate was involved in distributing food and supplies to needy victims.[21]

Local hospitals struggled to keep up with demand for medical treatment, largely due to collapsed or obstructed "lifelines" (roads) that kept supplies and personnel from reaching the affected areas. People were forced to wait in corridors due to the overcrowding and lack of space. Some people had to be operated on in waiting rooms and corridors.

To help speed the recovery effort, the government closed most of the Hanshin Expressway network to private vehicles from 6:00 am to 8:00 pm daily and limited traffic to buses, taxis and other designated vehicles.[22] To keep the light rail system running even though it had quite severely damaged sections, shuttle buses were commissioned to transfer patrons to stations around damaged sections.[23]

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See also

References
  1. ISC (2015), ISC-GEM Global Instrumental Earthquake Catalogue (1900–2009), Version 2.0, International Seismological Centre
  2. USGS (September 4, 2009), PAGER-CAT Earthquake Catalog, Version 2008_06.1, United States Geological Survey
  3. Comfort, Louise (1995). Self Organization in Disaster Response: The Great Hanshin Earthquake of January 17, 1995 (PDF). p. 12.
  4. The City of Kobe (January 1, 2009). "STATISTICS" (PDF). The Great Hanshin-Awaji Earthquake: Statistics and Restoration Progress. Archived from the original (PDF) on June 26, 2011. Retrieved November 29, 2009.
  5. Kobe City FIRE Bureau (January 17, 2006). "被害の状況". 阪神・淡路大震災. Kobe City Fire Bureau. Archived from the original on April 14, 2008. Retrieved May 25, 2008.
  6. "Earthquakes in Japan" (PDF) (in Japanese). Cabinet Office, Government of Japan. pp. 5–6. Archived from the original (PDF) on March 27, 2009. Retrieved May 6, 2009.
  7. "(2) Shallow inland earthquakes", Seismic Activity in Japan.
  8. Koketsu, Kazuki; Yoshida, Shingo; Higashihara, Hiromichi (1998). "A fault model of the 1995 Kobe earthquake derived from the GPS data on the Akashi Kaikyo Bridge and other datasets" (PDF). Earth, Planets and Space. 50 (10): 803. Bibcode:1998EP&S...50..803K. doi:10.1186/BF03352173.CS1 maint: ref=harv (link)
  9. "7-2(2)The 1995 Southern Hyogo Prefecture Earthquake", Seismic Activity in Japan.
  10. Somerville, Paul (February 7, 1995). "Kobe Earthquake: An Urban Disaster". Eos. 76 (6): 49. Bibcode:1995EOSTr..76...49S. doi:10.1029/EO076i006p00049-02 (inactive January 2, 2020). Archived from the original on May 1, 1997. Retrieved May 6, 2009.CS1 maint: ref=harv (link)
  11. Search result on JMA database (in Japanese) of seismic intensity.
  12. Anshel J. Schiff, ed. (1999). Hyogoken-Nanbu (Kobe) Earthquake of January 17, 1995: Lifeline Performance. Reston, VA: ASCE, TCLEE. ISBN 9780784404089. Archived from the original on December 18, 2013. Retrieved July 27, 2012.
  13. Seconds from disaster – Kobe Earthquake, National Geographic video
  14. Kyodo News, "Hunt for tsunami orphans hampered, unprecedented", Japan Times, April 2, 2011, p. 4.
  15. Kitamura, Yamamoto & Fujii 1998, p. 240
  16. "Economics Focus: The Cost of calamity". The Economist. The Economist Newspaper Limited. 398 (8725): 68. March 19–25, 2011.
  17. "'Disaster Prevention and Volunteerism Day' and 'Disaster Prevention and Volunteerism Week'" (in Japanese). Cabinet Office, Government of Japan. December 15, 1995. Archived from the original on May 25, 2009. Retrieved May 2, 2009.
  18. Burritt Sabin (October 31, 2004). "The Great Hanshin Earthquake: Lessons for Niigata". J@pan Inc Newsletter (No. 295). Japan Inc Communications. Retrieved May 25, 2008.
  19. "Restoration from the earthquake disaster – City planning based on the lessons learned from the disaster". Great Hanshin Earthquake Restoration. Kinki Regional Development Bureau, Ministry of Land, Infrastructure and Transport. Retrieved November 23, 2006.
  20. Japan Echo Inc. (April 2, 1998). "Earthquake Readiness: From Underground Stores to Satellite Monitoring". Trends in JAPAN. Ministry of Foreign Affairs.
  21. Fukushima, Glen S. (1995), "The Great Hanshin Earthquake", JPRI Occasional Paper (No. 2), Japan Policy Research Institute
  22. Kitamura, Yamamoto & Fujii 1998, p. 260
  23. Kitamura, Yamamoto & Fujii 1998, p. 256

Sources
  • Kitamura, R.; Yamamoto, T.; Fujii, S. (1998). "Impacts of the Hanshin-Awaji Earthquake on Traffic and Travel – Where Did All the Traffic Go?". In Cairns, S.; Hass-Klau, C.; Goodwin, P. (eds.). Traffic Impact of Highway Capacity Reductions: Assessment of the Evidence. London: Landor Publishing. pp. 239–261.CS1 maint: ref=harv (link)
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