Earthquake with magnitude of Md 2.9 on date 21-02-1985 and time 06:24:53 (UTC) in region 6 km W Tortona (AL)

A magnitude Md 2.9 earthquake occured in region: 6 km W Tortona (AL), on

  • 21-02-1985 06:24:53 (UTC)
  • 21-02-1985 07:24:53 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.88, 8.79 at 5 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
Tortona AL 6 27437 27437
Carbonara Scrivia AL 7 1122 28559
Spineto Scrivia AL 8 337 28896
Villaromagnano AL 8 715 29611
Villalvernia AL 9 955 30566
Pozzolo Formigaro AL 10 4775 35341
Piovera AL 10 851 36192
Sarezzano AL 10 1171 37363
Frugarolo AL 10 1968 39331
Paderna AL 10 220 39551
Viguzzolo AL 11 3148 42699
Bosco Marengo AL 11 2457 45156
Montecastello AL 11 321 45477
Sale AL 12 4172 49649
Pietra Marazzi AL 12 904 50553
Cerreto Grue AL 12 323 50876
Carezzano AL 12 431 51307
Rivarone AL 12 381 51688
Castellar Guidobono AL 13 399 52087
Berzano di Tortona AL 13 157 52244
Alluvioni CambiĆ² AL 13 912 53156
Costa Vescovato AL 13 335 53491
Castelnuovo Scrivia AL 13 5274 58765
Volpeglino AL 13 148 58913
Novi Ligure AL 13 28154 87067
Montegioco AL 14 313 87380
Fresonara AL 14 731 88111
Gavazzana AL 14 180 88291
Cassano Spinola AL 14 1731 90022
Basaluzzo AL 14 2087 92109
Casal Cermelli AL 14 1234 93343
Alessandria AL 14 93943 187286
Pontecurone AL 14 3723 191009
Castellania AL 14 90 191099
Bassignana AL 14 1709 192808
Sant'Agata Fossili AL 15 425 193233
Pasturana AL 15 1318 194551
Monleale AL 15 566 195117
Volpedo AL 15 1227 196344
Guazzora AL 15 305 196649
Pecetto di Valenza AL 15 1267 197916
Casalnoceto AL 16 980 198896
Avolasca AL 16 294 199190
Montemarzino AL 16 341 199531
Gambarana PV 17 225 199756
Sardigliano AL 17 406 200162
Francavilla Bisio AL 17 531 200693
Alzano Scrivia AL 17 377 201070
Suardi PV 17 624 201694
Isola Sant'Antonio AL 17 717 202411
Tassarolo AL 17 672 203083
Castellazzo Bormida AL 17 4570 207653
Casei Gerola PV 18 2500 210153
Predosa AL 18 2048 212201
Molino dei Torti AL 18 605 212806
Casasco AL 18 129 212935
Stazzano AL 18 2486 215421
Castelspina AL 19 416 215837
Rivanazzano Terme PV 19 5312 221149
Capriata d'Orba AL 19 1904 223053
Valenza AL 19 19178 242231
Pieve del Cairo PV 19 2063 244294
Pozzol Groppo AL 19 328 244622
Serravalle Scrivia AL 19 6128 250750
Garbagna AL 20 696 251446
Momperone AL 20 223 251669

Municipalities with at least 50000 inhabitants

An earthquake occurred to
14 Km E of Alessandria (93943 inhabitants)
45 Km SW of Pavia (72576 inhabitants)
46 Km E of Asti (76202 inhabitants)
49 Km S of Vigevano (63310 inhabitants)
53 Km N of Genova (586655 inhabitants)
64 Km S of Novara (104380 inhabitants)
68 Km NE of Savona (61345 inhabitants)
72 Km SW of Milano (1345851 inhabitants)
73 Km W of Piacenza (102191 inhabitants)
75 Km S of Rho (50434 inhabitants)
80 Km S of Legnano (60262 inhabitants)
81 Km SW of Sesto San Giovanni (81608 inhabitants)
82 Km S of Busto Arsizio (83106 inhabitants)
82 Km SW of Cinisello Balsamo (75078 inhabitants)
87 Km S of Gallarate (53343 inhabitants)
87 Km SW of Monza (122671 inhabitants)
88 Km E of Moncalieri (57294 inhabitants)
90 Km E of Torino (890529 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
Rev 1000 Md 2.9 1985-02-21
06:24:53
44.88 8.79 5 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 2129
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-02-21 06:24:53 ± 0.534
Latitude 44.88 ± 0.01
Longitude 8.79 ± 0.02
Depth (km) 5 ± 4 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 2129

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) 1857.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 48
Number of associated phases, regardless of their use for origin computation 41
Number of defining phases 41
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.7
Epicentral distance of station closest to the epicenter (degree) 0.00421
Epicentral distance of station farthest from the epicenter (degree) 0.04023
Number of stations at which the event was observed 27
Number of stations from which data was used for origin computation 27
Magnitude information

Md:2.9

Field Value
Value 2.9
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 2129
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:07:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.BGF.Z. 1985-02-21T06:26:02.30 10.0 undecidable manual PN 294 0.0402 0.82 0.6
--.SMF.Z. 1985-02-21T06:25:55.00 10.0 undecidable manual PN 298 0.0348 1.72 0.2
--.HAU.Z. 1985-02-21T06:25:49.10 10.0 undecidable manual PN 332 0.0319 0.33 1
--.SLE.Z. 1985-02-21T06:25:39.10 10.0 undecidable manual PN 356 0.026 -0.65 0.8
--.STV.Z. 1985-02-21T06:25:33.50 10.0 undecidable manual SN 239 0.0109 -0.52 0.6
--.ENR.Z. 1985-02-21T06:25:33.50 10.0 undecidable manual SN 236 0.0105 0.45 0.7
--.LMR.Z. 1985-02-21T06:25:32.00 10.0 undecidable manual PN 227 0.0202 0.99 0.8
--.LRG.Z. 1985-02-21T06:25:32.00 10.0 undecidable manual PN 231 0.0202 1.01 0.8
--.IMP.Z. 1985-02-21T06:25:31.80 10.0 undecidable manual SN 214 0.0104 -0.82 0.5
--.CVF.Z. 1985-02-21T06:25:30.50 10.0 undecidable manual PN 178 0.0208 -1.33 0.5
--.BG1.Z. 1985-02-21T06:25:30.50 10.0 undecidable manual SN 35 0.0099 -0.84 0.4
--.MUO.Z. 1985-02-21T06:25:30.90 10.0 undecidable manual PN 357 0.0189 1.96 0.2
--.GAI.Z. 1985-02-21T06:25:28.00 10.0 undecidable manual SG 279 0.0092 -1.26 0.2
--.FRF.Z. 1985-02-21T06:25:28.70 10.0 undecidable manual PN 230 0.0182 0.81 1.1
--.VAI.N. 1985-02-21T06:25:27.20 10.0 undecidable manual SG 359 0.0088 -0.52 0.5
--.ORO.Z. 1985-02-21T06:25:26.00 10.0 undecidable manual SG 322 0.0084 -0.24 1
--.ORX.Z. 1985-02-21T06:25:25.80 10.0 undecidable manual SG 323 0.0084 -0.56 0.5
--.VDL.Z. 1985-02-21T06:25:24.10 10.0 undecidable manual PN 16 0.015 1.07 1
--.ROB.Z. 1985-02-21T06:25:24.60 10.0 undecidable manual SG 228 0.0079 0.45 0.7
--.DIX.Z. 1985-02-21T06:25:22.50 10.0 undecidable manual PN 321 0.0138 1.28 0.8
--.BVT.Z. 1985-02-21T06:25:21.50 10.0 undecidable manual SG 118 0.0074 -1.38 0.2
--.FIN.Z. 1985-02-21T06:25:19.90 10.0 undecidable manual SG 211 0.007 -1.6 0.2
--.STV.Z. 1985-02-21T06:25:17.90 10.0 undecidable manual PN 239 0.0109 1.12 0.9
--.MMK.Z. 1985-02-21T06:25:17.50 10.0 undecidable manual PN 334 0.0117 -0.49 1.5
--.ENR.Z. 1985-02-21T06:25:16.60 10.0 positive manual PN 236 0.0105 0.38 1.8
--.VEA.Z. 1985-02-21T06:25:16.00 10.0 undecidable manual SG 89 0.0053 1.09 0.4
--.IMP.Z. 1985-02-21T06:25:15.60 10.0 positive manual PN 214 0.0104 -0.38 1.7
--.CK1.Z. 1985-02-21T06:25:14.50 10.0 undecidable manual SG 218 0.0053 -0.5 1
--.BG1.Z. 1985-02-21T06:25:14.00 10.0 undecidable manual PN 35 0.0099 -1.23 0.6
--.GAI.Z. 1985-02-21T06:25:13.10 10.0 undecidable manual PG 279 0.0092 -0.93 1
--.ORO.Z. 1985-02-21T06:25:12.00 10.0 positive manual PG 322 0.0084 -0.29 3.4
--.GEN.Z. 1985-02-21T06:25:12.40 10.0 undecidable manual SG 167 0.0042 1.08 0.3
--.VAI.Z. 1985-02-21T06:25:12.80 10.0 undecidable manual PG 359 0.0088 -0.34 3.3
--.ORX.Z. 1985-02-21T06:25:12.00 10.0 undecidable manual PG 323 0.0084 -0.36 1.6
--.ROB.Z. 1985-02-21T06:25:11.10 10.0 undecidable manual PG 228 0.0079 0.02 1.9
--.BVT.Z. 1985-02-21T06:25:09.20 10.0 undecidable manual PG 118 0.0074 -1.15 0.8
--.FIN.Z. 1985-02-21T06:25:09.40 10.0 undecidable manual PG 211 0.007 -0.15 1.9
--.PCN.Z. 1985-02-21T06:25:08.50 10.0 undecidable manual PG 74 0.0057 1.73 0.4
--.CK1.Z. 1985-02-21T06:25:06.00 10.0 undecidable manual PG 218 0.0053 0.2 1.8
--.VEA.Z. 1985-02-21T06:25:05.90 10.0 negative manual PG 89 0.0053 0.15 1.9
--.GEN.Z. 1985-02-21T06:25:03.00 10.0 undecidable manual PG 167 0.0042 -0.67 1.4
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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