Earthquake with magnitude of Md 3.6 on date 21-06-1986 and time 22:57:30 (UTC) in region 9 km NE Forlì (FC)

A magnitude Md 3.6 earthquake occured in region: 9 km NE Forlì (FC), on

  • 21-06-1986 22:57:30 (UTC)
  • 22-06-1986 00:57:30 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.292, 12.106 at 24 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Forlì FC 9 117913 117913
Russi RA 11 12247 130160
Forlimpopoli FC 12 13290 143450
Ravenna RA 16 159116 302566
Bertinoro FC 16 11059 313625
Cotignola RA 17 7474 321099
Bagnacavallo RA 17 16739 337838
Faenza RA 18 58541 396379
Castrocaro Terme e Terra del Sole FC 18 6426 402805
Meldola FC 19 9970 412775
Cervia RA 20 28940 441715

Municipalities with at least 50000 inhabitants

An earthquake occurred to
9 Km NE of Forlì (117913 inhabitants)
16 Km SW of Ravenna (159116 inhabitants)
18 Km E of Faenza (58541 inhabitants)
20 Km NW of Cesena (96758 inhabitants)
32 Km E of Imola (69797 inhabitants)
45 Km NW of Rimini (147750 inhabitants)
65 Km E of Bologna (386663 inhabitants)
72 Km SE of Ferrara (133155 inhabitants)
77 Km NW of Pesaro (94582 inhabitants)
88 Km NW of Fano (60888 inhabitants)
89 Km NE of Firenze (382808 inhabitants)
90 Km S of Rovigo (51867 inhabitants)
93 Km E of Prato (191150 inhabitants)
93 Km N of Arezzo (99543 inhabitants)
95 Km NE of Scandicci (50609 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000
Md 3.6
M 3.9
1986-06-21
22:57:30
44.292 12.106 24 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 29899
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1986-06-21 22:57:30 ± 0.488
Latitude 44.2920 ± 0.0189
Longitude 12.1060 ± 0.0200
Depth (km) 24 ± 4 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 29899

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 2639.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 83
Number of associated phases, regardless of their use for origin computation 54
Number of defining phases 54
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.6
Epicentral distance of station closest to the epicenter (degree) 0.00469
Epicentral distance of station farthest from the epicenter (degree) 0.06184
Number of stations at which the event was observed 48
Number of stations from which data was used for origin computation 48
Magnitudes information

Md:3.6

Field Value
Value 3.6
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 29899
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:31:10

M:3.9

Field Value
Value 3.9
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 29899
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 09:50:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.RRL.Z. 1986-06-21T22:59:09.00 10.0 undecidable manual SN 280 0.0345 -0.74 0.4
--.BGF.Z. 1986-06-21T22:59:09.50 10.0 undecidable manual PN 292 0.0618 -0.11 1
--.SSF.Z. 1986-06-21T22:59:06.00 10.0 undecidable manual PN 297 0.0594 0.03 1
--.AVF.Z. 1986-06-21T22:59:05.80 10.0 undecidable manual PN 294 0.0595 -0.23 1
--.LOR.Z. 1986-06-21T22:59:04.00 10.0 undecidable manual PN 299 0.0582 -0.05 1
--.LBF.Z. 1986-06-21T22:59:01.60 10.0 undecidable manual PN 297 0.0565 0.12 1
--.SMF.Z. 1986-06-21T22:59:00.00 10.0 undecidable manual PN 294 0.0562 -1.02 0.5
--.STV.Z. 1986-06-21T22:58:59.40 10.0 undecidable manual SN 270 0.0308 -0.35 0.6
--.IMP.Z. 1986-06-21T22:58:50.30 10.0 undecidable manual SN 263 0.0274 -0.62 0.5
--.HAU.Z. 1986-06-21T22:58:49.60 10.0 undecidable manual PN 314 0.049 -0.39 1
--.CDF.Z. 1986-06-21T22:58:47.80 10.0 undecidable manual PN 322 0.0476 -0.14 1.1
--.VAI.E. 1986-06-21T22:58:45.00 10.0 undecidable manual SN 304 0.0254 -0.8 0.4
--.BSF.Z. 1986-06-21T22:58:45.00 10.0 undecidable manual PN 315 0.0459 -0.35 1.1
--.FIN.Z. 1986-06-21T22:58:43.80 10.0 undecidable manual SN 269 0.0251 -1.05 0.3
--.LRG.Z. 1986-06-21T22:58:34.00 10.0 undecidable manual PN 260 0.038 0.8 0.9
--.LMR.Z. 1986-06-21T22:58:32.40 10.0 undecidable manual PN 258 0.0373 0.23 1.3
--.LPG.Z. 1986-06-21T22:58:30.00 10.0 undecidable manual PN 289 0.0358 0.16 1.3
--.FRF.Z. 1986-06-21T22:58:30.40 10.0 undecidable manual PN 260 0.0359 0.3 1.3
--.RRL.Z. 1986-06-21T22:58:27.80 10.0 undecidable manual PN 280 0.0345 -0.13 1.4
--.FG3.Z. 1986-06-21T22:58:26.00 10.0 undecidable manual PN 130 0.0343 -1.63 0.3
--.LSD.Z. 1986-06-21T22:58:24.20 10.0 undecidable manual PN 289 0.0332 -1.74 0.2
--.SOO.Z. 1986-06-21T22:58:23.70 10.0 undecidable manual PN 274 0.0322 -0.67 1.1
--.STV.Z. 1986-06-21T22:58:22.20 10.0 undecidable manual PN 270 0.0308 0.05 1.5
--.DA9.Z. 1986-06-21T22:58:22.50 10.0 undecidable manual PN 274 0.0312 -0.47 1.3
--.MMK.Z. 1986-06-21T22:58:21.00 10.0 negative manual PN 302 0.0306 -1 0.8
--.SBF.Z. 1986-06-21T22:58:21.80 10.0 undecidable manual PN 263 0.0304 0.16 1.5
--.BVT.Z. 1986-06-21T22:58:20.60 10.0 undecidable manual SN 276 0.0148 2.98 0
--.ORO.Z. 1986-06-21T22:58:19.00 10.0 undecidable manual PN? 295 0.0288 -0.27 0.6
--.IMP.Z. 1986-06-21T22:58:16.90 10.0 undecidable manual PN 263 0.0274 -0.16 1.5
--.ROB.Z. 1986-06-21T22:58:16.60 10.0 undecidable manual PN 271 0.0272 -0.2 1.5
--.TMA.Z. 1986-06-21T22:58:15.00 10.0 negative manual PN 309 0.0261 -0.19 1.5
--.VDL.Z. 1986-06-21T22:58:15.50 10.0 negative manual PN 320 0.0258 0.88 1
--.OSS.Z. 1986-06-21T22:58:14.80 10.0 negative manual PN 330 0.0248 1.66 0.3
--.FIN.Z. 1986-06-21T22:58:13.20 10.0 undecidable manual PN 269 0.0251 -0.34 1.4
--.VAI.Z. 1986-06-21T22:58:13.80 10.0 undecidable manual PN 304 0.0254 -0.3 1.4
--.CKI.Z. 1986-06-21T22:58:13.00 10.0 undecidable manual PN 273 0.0246 0.18 1.5
--.LJU.Z. 1986-06-21T22:58:09.15 10.0 undecidable manual PN 42 0.0219 0.35 1.4
--.MDI.Z. 1986-06-21T22:58:07.00 10.0 undecidable manual PN 311 0.0202 0.87 1
--.RBL.Z. 1986-06-21T22:58:07.70 10.0 undecidable manual PN 24 0.0214 -0.21 1.5
--.GEN.Z. 1986-06-21T22:58:07.50 10.0 undecidable manual PN 273 0.0204 1.15 0.7
--.CEY.Z. 1986-06-21T22:58:05.60 10.0 undecidable manual PN 47 0.0197 0.35 1.4
--.VOY.Z. 1986-06-21T22:58:04.40 10.0 positive manual PN 34 0.0193 -0.31 2.9
--.MAO.Z. 1986-06-21T22:58:03.70 10.0 undecidable manual PN 200 0.018 1.05 0.8
--.CO9.Z. 1986-06-21T22:58:03.50 10.0 undecidable manual PN 284 0.0176 1.46 0.4
--.MNS.Z. 1986-06-21T22:58:02.30 10.0 undecidable manual PN 167 0.0175 0.27 1.5
--.VEA.Z. 1986-06-21T22:58:02.40 10.0 undecidable manual PN 289 0.0168 1.52 0.4
--.TRI.Z. 1986-06-21T22:58:00.00 10.0 undecidable manual PN 38 0.0165 -0.47 1.3
--.BVT.Z. 1986-06-21T22:57:59.60 10.0 undecidable manual PN 276 0.0148 1.77 0.2
--.SAL.Z. 1986-06-21T22:57:59.00 10.0 undecidable manual PN 319 0.0155 0.07 1.5
--.SU9.Z. 1986-06-21T22:57:54.70 10.0 undecidable manual PN 161 0.0118 1.44 0.8
--.BDI.Z. 1986-06-21T22:57:49.20 10.0 negative manual PN 258 0.0099 -1.21 1.2
--.ARV.Z. 1986-06-21T22:57:48.00 10.0 undecidable manual PN 141 0.0089 -0.91 0.9
--.FIR.Z. 1986-06-21T22:57:44.00 10.0 undecidable manual PN 229 0.0072 -2.23 0.1
--.MI5.Z. 1986-06-21T22:57:41.90 10.0 undecidable manual PG 304 0.0047 -0.14 1.5
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
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Type Description Link
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