Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.4 on date 12-04-1990 and time 08:49:05 (UTC) in region 6 km SE Ponzone (AL)

A magnitude Md 2.4 earthquake occured in region: 6 km SE Ponzone (AL), on

  • 12-04-1990 08:49:05 (UTC)
  • 12-04-1990 10:49:05 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.5490, 8.5070 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Ponzone AL 6 1051 1051
Morbello AL 6 402 1453
Malvicino AL 7 85 1538
Sassello SV 8 1777 3315
Cassinelle AL 8 914 4229
Cartosio AL 8 747 4976
Grognardo AL 9 259 5235
Tiglieto GE 9 546 5781
Urbe SV 10 700 6481
Mioglia SV 10 526 7007
Cavatore AL 10 291 7298
Pareto AL 10 554 7852
Molare AL 11 2181 10033
Prasco AL 11 521 10554
Montechiaro d'Acqui AL 11 560 11114
Cremolino AL 12 1086 12200
Castelletto d'Erro AL 12 148 12348
Melazzo AL 12 1325 13673
Visone AL 13 1194 14867
Pontinvrea SV 13 847 15714
Rossiglione GE 13 2779 18493
Morsasco AL 13 679 19172
Spigno Monferrato AL 14 1050 20222
Giusvalla SV 14 441 20663
Ponti AL 14 606 21269
Mombaldone AT 14 209 21478
Trisobbio AL 14 655 22133
Acqui Terme AL 15 19896 42029
Denice AL 15 176 42205
Ovada AL 15 11477 53682
Belforte Monferrato AL 15 515 54197
Terzo AL 15 923 55120
Campo Ligure GE 15 2955 58075
Tagliolo Monferrato AL 16 1581 59656
Orsara Bormida AL 16 424 60080
Montaldo Bormida AL 16 664 60744
Carpeneto AL 16 977 61721
Bistagno AL 17 1887 63608
Strevi AL 17 2019 65627
Stella SV 17 3009 68636
Merana AL 17 189 68825
Masone GE 17 3679 72504
Piana Crixia SV 17 788 73292
Rocca Grimalda AL 18 1512 74804
Monastero Bormida AT 18 931 75735
Rivalta Bormida AL 19 1446 77181
Sessame AT 19 271 77452
Dego SV 19 1985 79437
Lerma AL 19 869 80306
Montabone AT 19 333 80639
Roccaverano AT 19 399 81038
Serole AT 20 123 81161

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km N of Savona (61345 inhabitants)
37 Km W of Genova (586655 inhabitants)
42 Km S of Alessandria (93943 inhabitants)
46 Km SE of Asti (76202 inhabitants)
78 Km E of Cuneo (56081 inhabitants)
82 Km SE of Moncalieri (57294 inhabitants)
88 Km SE of Torino (890529 inhabitants)
88 Km SW of Pavia (72576 inhabitants)
90 Km SW of Vigevano (63310 inhabitants)
99 Km NE of Sanremo (54807 inhabitants)
100 Km S of Novara (104380 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 2.4
ML-VAX 1.8 		1990-04-12
08:49:05		 44.549 8.507 5 2013-07-15
08:41:04		 Bollettino Sismico Italiano INGV 114059
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1990-04-12 08:49:05 ± 0.177
Latitude 44.5490 ± 0.0262
Longitude 8.5070 ± 0.0141
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 114059

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) 3115.1
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 159
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00186
Epicentral distance of station farthest from the epicenter (degree) 0.01247
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitudes information

Md:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 114059
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 18:46:04

ML:1.8

Field Value
Value 1.8
Uncertainty
Num. used stations 2
Type of magnitude ML
Reference to an origin 114059
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.BNI.Z. 1990-04-12T08:49:50.00 10.0 undecidable manual SN 291 1.3875 -0.4 0.3
--.DOI.Z. 1990-04-12T08:49:37.50 10.0 undecidable manual SG 267 0.8991 0.25 0.5
--.BNI.Z. 1990-04-12T08:49:31.50 10.0 positive manual PN 291 1.3875 0.08 2.1
--.BOB.Z. 1990-04-12T08:49:30.50 10.0 undecidable manual SG 71 0.6993 -0.44 0.2
--.DOI.Z. 1990-04-12T08:49:23.72 10.0 undecidable manual PG 267 0.8991 -0.11 1.3
--.BOB.Z. 1990-04-12T08:49:20.27 10.0 positive manual PG 71 0.6993 0.08 2.8
--.CKI.Z. 1990-04-12T08:49:14.50 10.0 undecidable manual SG 231 0.2109 0.81 0.3
--.CKI.Z. 1990-04-12T08:49:09.55 10.0 positive manual PG 231 0.2109 -0.68 0.5
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download