The 1929 Murchison earthquake occurred at 10:17 am on 17 June. It struck the Murchison region of the South Island, with an estimated magnitude of 7.3, and was felt throughout New Zealand. There were 17 deaths, mostly as a result of landslides triggered by the earthquake. The rumbling sound of the earthquake was loud enough to be heard at New Plymouth, more than 250 km (155 mi) away.[2]
New Zealand sits astride the boundary between the Indo-Australian Plate and the Pacific Plate. In the South Island most of the displacement is taken up on the Alpine Fault passing to the north onto a set of strike-slip faults, the Marlborough Fault System. The sense of displacement across the plate boundary is oblique and most of the faults have a reverse component of slip. Some of the resulting deformation is accommodated within the plates themselves away from the boundary.[3] The 1929 Murchison earthquake occurred on the White Creek Fault, located in the Buller Gorge.[1]
Damageedit
Wreckage of the tower of the main building at Nelson College following the earthquakeMajor active fault zones of New Zealand showing variation in displacement vector of Pacific Plate relative to Australian Plate along the boundary
Although the epicentre was in a sparsely populated area about 65 km (40 mi) north of Murchison, the shaking in the surrounding region was intense enough to cause damage over a wide area. The towns of Nelson, Greymouth and Westport were all affected and roads, buildings and bridges were severely damaged throughout an area estimated at 26,000 km2 (10,000 mi2).[1] The worst damage was caused by landslides triggered by the shaking, which destroyed several homes and resulted in 14 of the 17 deaths. Two other deaths were caused by coal mine collapses. Most of the buildings in the Murchison area were built of wood and were warped and moved from their piles, but many brick buildings and chimneys were damaged in Nelson, Greymouth and Westport.[2]
Characteristicsedit
The earthquake was preceded by several foreshocks before the mainshock, accompanied by booming sounds in the mountains around Murchison.[2] There was a large surfacefault rupture visible in the Buller River, indicating about 4.5 m (14.8 ft) of vertical movement and 2.5 m (8.2 ft) of lateral movement. The earthquake triggered many landslides and these created 38 new lakes, of which 21 still exist, including Lake Stanley, on Stanley River.[1] The Maruia Falls are also a notable by-product of the earthquake. The earthquake was accompanied by unusually loud rumbling noises that were heard as far away as New Plymouth. A maximum intensity of X (Extreme) on the Mercalli intensity scale has been estimated for Murchison. Most of the northern part of South Island suffered an intensity of VII (Very strong) or greater.[2]
Aftermathedit
The landslides blocked many roads causing food supplies to run out in some areas near the epicentre. This and the risk of aftershocks and flooding from landslides blocking rivers caused many residents to evacuate the area, mostly on foot. Karamea was completely cut off and received no outside help for two weeks, until a de Havilland Tiger Moth plane landed on the beach. Some of the blocked roads took months to clear.[2]
Importance for studying the Earth's interioredit
Analysing the seismic waves from this earthquake appearing in the shadow zone, Inge Lehmann demonstrated that there must be a solid inner core that reflected p-waves.
^ abcdeGeoNet (17 June 1929). "M 7.8, Buller (Murchison)". from the original on 4 June 2010. Retrieved 28 June 2010.
^ abcdefMcSaveney, E. (2 March 2009). "The 1929 Arthur's Pass and Murchison earthquakes". Te Ara – the Encyclopedia of New Zealand. Retrieved 28 June 2010.
^West Coast Regional Council (2002). (PDF). Archived from the original (PDF) on 25 May 2010. Retrieved 28 June 2010.
External linksedit
Wikimedia Commons has media related to 1929 Murchison earthquake.
Landslide blog about the earthquake by Professor Dave Petley, Durham University, UK
The International Seismological Centre has a bibliography and/or authoritative data for this event.
November 26, 2023
1929, murchison, earthquake, occurred, june, struck, murchison, region, south, island, with, estimated, magnitude, felt, throughout, zealand, there, were, deaths, mostly, result, landslides, triggered, earthquake, rumbling, sound, earthquake, loud, enough, hea. The 1929 Murchison earthquake occurred at 10 17 am on 17 June It struck the Murchison region of the South Island with an estimated magnitude of 7 3 and was felt throughout New Zealand There were 17 deaths mostly as a result of landslides triggered by the earthquake The rumbling sound of the earthquake was loud enough to be heard at New Plymouth more than 250 km 155 mi away 2 1929 Murchison earthquakeUTC time1929 06 16 22 47 30ISC event908150USGS ANSSComCatLocal date17 June 1929 1929 06 17 Local time10 17MagnitudeMs 7 8 Mw 7 3 1 Depth12 km 7 5 mi Epicentre41 33 S 172 15 E 41 55 S 172 25 E 41 55 172 25 1 Areas affectedSouth Island New ZealandMax intensityX Extreme 2 Casualties17 deaths others injured Contents 1 Tectonic setting 2 Damage 3 Characteristics 4 Aftermath 5 Importance for studying the Earth s interior 6 See also 7 References 8 External linksTectonic setting editNew Zealand sits astride the boundary between the Indo Australian Plate and the Pacific Plate In the South Island most of the displacement is taken up on the Alpine Fault passing to the north onto a set of strike slip faults the Marlborough Fault System The sense of displacement across the plate boundary is oblique and most of the faults have a reverse component of slip Some of the resulting deformation is accommodated within the plates themselves away from the boundary 3 The 1929 Murchison earthquake occurred on the White Creek Fault located in the Buller Gorge 1 Damage edit nbsp Wreckage of the tower of the main building at Nelson College following the earthquake nbsp Major active fault zones of New Zealand showing variation in displacement vector of Pacific Plate relative to Australian Plate along the boundaryAlthough the epicentre was in a sparsely populated area about 65 km 40 mi north of Murchison the shaking in the surrounding region was intense enough to cause damage over a wide area The towns of Nelson Greymouth and Westport were all affected and roads buildings and bridges were severely damaged throughout an area estimated at 26 000 km2 10 000 mi2 1 The worst damage was caused by landslides triggered by the shaking which destroyed several homes and resulted in 14 of the 17 deaths Two other deaths were caused by coal mine collapses Most of the buildings in the Murchison area were built of wood and were warped and moved from their piles but many brick buildings and chimneys were damaged in Nelson Greymouth and Westport 2 Characteristics editThe earthquake was preceded by several foreshocks before the mainshock accompanied by booming sounds in the mountains around Murchison 2 There was a large surface fault rupture visible in the Buller River indicating about 4 5 m 14 8 ft of vertical movement and 2 5 m 8 2 ft of lateral movement The earthquake triggered many landslides and these created 38 new lakes of which 21 still exist including Lake Stanley on Stanley River 1 The Maruia Falls are also a notable by product of the earthquake The earthquake was accompanied by unusually loud rumbling noises that were heard as far away as New Plymouth A maximum intensity of X Extreme on the Mercalli intensity scale has been estimated for Murchison Most of the northern part of South Island suffered an intensity of VII Very strong or greater 2 Aftermath editThe landslides blocked many roads causing food supplies to run out in some areas near the epicentre This and the risk of aftershocks and flooding from landslides blocking rivers caused many residents to evacuate the area mostly on foot Karamea was completely cut off and received no outside help for two weeks until a de Havilland Tiger Moth plane landed on the beach Some of the blocked roads took months to clear 2 Importance for studying the Earth s interior editAnalysing the seismic waves from this earthquake appearing in the shadow zone Inge Lehmann demonstrated that there must be a solid inner core that reflected p waves See also editList of earthquakes in 1929 List of earthquakes in New ZealandReferences edit a b c d e GeoNet 17 June 1929 M 7 8 Buller Murchison Archived from the original on 4 June 2010 Retrieved 28 June 2010 a b c d e f McSaveney E 2 March 2009 The 1929 Arthur s Pass and Murchison earthquakes Te Ara the Encyclopedia of New Zealand Retrieved 28 June 2010 West Coast Regional Council 2002 Earthquake Hazards PDF Archived from the original PDF on 25 May 2010 Retrieved 28 June 2010 External links edit nbsp Wikimedia Commons has media related to 1929 Murchison earthquake Landslide blog about the earthquake by Professor Dave Petley Durham University UK The International Seismological Centre has a bibliography and or authoritative data for this event Retrieved from https en wikipedia org w index php title 1929 Murchison earthquake amp oldid 1181661701, wikipedia, wiki, book, books, library,
