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1986 Vrancea earthquake

Earthquake in Romania

Field	Value
title	1986 Vrancea earthquake
map2	{{Location map many	Romania
relief	yes
width	250
float	right
mark	Bullseye1.png
marksize	50
lat_deg	45
lat_min	30
lat_dir	N
lon_deg	26
lon_min	30
lon_dir	E
label2	Focșani	label2_size=120
position2	right
lat2_deg	45	lat2_min = 42	lat2_sec = 0	lat2_dir = N
lon2_deg	27	lon2_min = 10	lon2_sec = 47	lon2_dir = E
label3	Bucharest	label3_size=120
position3	right
lat3_deg	44	lat3_min = 25	lat3_sec = 57	lat3_dir = N
lon3_deg	26	lon3_min = 6	lon3_sec = 14	lon3_dir = E
timestamp	1986-08-30 21:28:55
isc-event	489699
anss-url	usp0002xpm
local-date
local-time	00:28:55 (EET)
magnitude	6.5
7.2
depth	131 km
location
damage	55,000 homes damaged
intensity
PGA
landslide	Yes
foreshocks	5.3 (16 August 1986)
aftershocks	77
casualties	2 deaths, 558 injuries (official)
Over 150 deaths (unofficial)

|isc-event = 489699 |anss-url = usp0002xpm |local-date = |local-time = 00:28:55 (EET) 7.2 Over 150 deaths (unofficial)

Striking central Romania on August 30 at 21:28 UTC, the 1986 Vrancea earthquake killed more than 150 people, injured over 500, and damaged over 50,000 homes. The second largest earthquake in the area since the modernization of earthquake monitoring devices, it was felt north to Poland and south to Italy and Greece. The death toll makes it the second deadliest earthquake to occur in 1986 worldwide, after major seism of San Salvador that took the lives of almost 1,500 people.

One local news facility listed that the earthquake measured 6.5 on the Richter scale, and the USGS listed its seismic moments as 5.6 and 7.9. Its epicenter was somewhere in the Vrancea Mountains.

The focal mechanism of the earthquake was described as "moderately well controlled", suggesting reverse faulting with some strike-slip motion.

Geography

The epicenter was pinpointed to Vrancea County, specifically to the Vrancea Mountains, about 110 mi north of Bucharest. In 1977, another strong quake ruptured oil fields in the area.

Aftershocks

The rupture was located at a depth of between 131 and 148 km, as revealed by the location of aftershock hypocenters. The strongest aftershock occurred in the morning of September 2, 1986, at 05:00 (EET), at 143 km depth, with magnitude 5.0 , and was felt in Bucharest with an intensity of about III–IV degrees on the Mercalli intensity scale. In total, 77 aftershocks were recorded with a magnitude over 3.2 on the Richter scale, of which 19 exceeded the value of 4.0 magnitude on the Richter scale.

Damage and casualties

The earthquake was felt in at least eight geographically diverse countries, affecting most of southeast Europe. The worst affected area was in the Focșani–Bârlad region, where intensity VIII (Severe) damage was recorded, causing a church to collapse.

Causing 2 deaths, the earthquake also injured 558 people and about 55,000 homes damaged, leaving more than 12,500 people homeless in the Chișinău–Cahul area. Intensity of VII (Very strong) was reported in Bucharest and in northern Bulgaria. In addition, intensities of V (Moderate) were recorded in Skopje (now the capital of North Macedonia), suggesting the earthquake was widespread. This is confirmed by reports of the earthquake as far north as Hungary and east Poland, and as far south as Greece and Italy. Lesser intensities of IV (Light) in Simferopol and Kiev in the Soviet Union and in Belgrade, Yugoslavia, and III (Weak) in Moscow and Titograd, Yugoslavia were recorded.

References

"Sd4.eu".
Monfret, Tony. (April 1990). "The Romanian earthquake of August 30, 1986: A study based on GEOSCOPE very long-period and broadband data". Pure and Applied Geophysics.
(September 1, 1986). "Major Earthquake Rocks Eastern Europe". [[AGERPRES]].
(2010). "Prediction of the seismic manifestations of Vrancea earthquakes in Moscow". Izvestiya, Physics of the Solid Earth.
[http://www.infp.ro/local-seismicity/romanian-seismicity "Seismicity of Romania"] {{Webarchive. link. (2013-02-12 , ''National Institute for Earth Physics'', section ''Vrancea subcrustal zone'')
(July 16, 2008). "Significant Earthquakes of the World: 1986". United States Geological Survey.

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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