Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.0 on date 08-04-1987 and time 12:13:26 (Italy) in region 3 km SE Malvicino (AL)

A magnitude Md 2.0 earthquake occured in region: 3 km SE Malvicino (AL), on

  • 08-04-1987 10:13:26 (UTC)
  • 08-04-1987 12:13:26 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.5450, 8.4440 at 16 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
Malvicino AL 3 85 85
Ponzone AL 5 1051 1136
Cartosio AL 6 747 1883
Pareto AL 6 554 2437
Mioglia SV 7 526 2963
Montechiaro d'Acqui AL 8 560 3523
Sassello SV 8 1777 5300
Morbello AL 9 402 5702
Spigno Monferrato AL 9 1050 6752
Mombaldone AT 9 209 6961
Cavatore AL 10 291 7252
Castelletto d'Erro AL 10 148 7400
Grognardo AL 10 259 7659
Denice AL 11 176 7835
Pontinvrea SV 11 847 8682
Ponti AL 11 606 9288
Melazzo AL 11 1325 10613
Giusvalla SV 11 441 11054
Cassinelle AL 12 914 11968
Merana AL 12 189 12157
Piana Crixia SV 13 788 12945
Urbe SV 13 700 13645
Prasco AL 14 521 14166
Visone AL 14 1194 15360
Terzo AL 14 923 16283
Tiglieto GE 14 546 16829
Bistagno AL 14 1887 18716
Roccaverano AT 15 399 19115
Serole AT 15 123 19238
Monastero Bormida AT 15 931 20169
Dego SV 15 1985 22154
Acqui Terme AL 15 19896 42050
Molare AL 15 2181 44231
Cremolino AL 15 1086 45317
Morsasco AL 16 679 45996
Sessame AT 16 271 46267
Olmo Gentile AT 16 80 46347
Stella SV 17 3009 49356
Trisobbio AL 17 655 50011
San Giorgio Scarampi AT 18 122 50133
Montabone AT 18 333 50466
Bubbio AT 18 893 51359
Rossiglione GE 18 2779 54138
Strevi AL 18 2019 56157
Orsara Bormida AL 19 424 56581
Perletto CN 19 292 56873
Ovada AL 19 11477 68350
Montaldo Bormida AL 19 664 69014
Belforte Monferrato AL 20 515 69529
Castel Rocchero AT 20 395 69924
Cessole AT 20 403 70327
Cassinasco AT 20 611 70938
Rocchetta Palafea AT 20 338 71276
Pezzolo Valle Uzzone CN 20 344 71620
Carpeneto AL 20 977 72597
Vesime AT 20 622 73219

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km N of Savona (61345 inhabitants)
42 Km W of Genova (586655 inhabitants)
43 Km SW of Alessandria (93943 inhabitants)
44 Km SE of Asti (76202 inhabitants)
73 Km E of Cuneo (56081 inhabitants)
79 Km SE of Moncalieri (57294 inhabitants)
84 Km SE of Torino (890529 inhabitants)
91 Km SW of Pavia (72576 inhabitants)
92 Km SW of Vigevano (63310 inhabitants)
96 Km NE of Sanremo (54807 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 2.0
M 2.1 		1987-04-08
10:13:26		 44.545 8.444 16 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 44399
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-04-08 10:13:26 ± 0.424
Latitude 44.5450 ± 0.0207
Longitude 8.4440 ± 0.0250
Depth (km) 16 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 44399

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) 3041.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 298
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00154
Epicentral distance of station farthest from the epicenter (degree) 0.00858
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitudes information

Md:2.0

Field Value
Value 2.0
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 44399
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:43:50

M:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 44399
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(km) Takeoff_angle Residual Weight
--.SOO.Z. 1987-04-08T10:13:59.00 10.0 undecidable manual SN 267 0.9546 0.01 0.8
--.STV.Z. 1987-04-08T10:13:56.00 10.0 undecidable manual SG 249 0.8436 -0.1 0.8
--.DA9.Z. 1987-04-08T10:13:56.20 10.0 undecidable manual SG 267 0.8547 -0.14 0.8
--.SOO.Z. 1987-04-08T10:13:45.50 10.0 undecidable manual PN 267 0.9546 0.06 1.9
--.DA9.Z. 1987-04-08T10:13:44.40 10.0 undecidable manual PG 267 0.8547 0.49 1
--.STV.Z. 1987-04-08T10:13:43.30 10.0 undecidable manual PG 249 0.8436 -0.47 1.1
--.FIN.Z. 1987-04-08T10:13:40.80 10.0 undecidable manual SG 206 0.3663 -0.31 0.7
--.FIN.Z. 1987-04-08T10:13:35.50 10.0 undecidable manual PG 206 0.3663 0.39 1.6
--.CKI.Z. 1987-04-08T10:13:35.60 10.0 undecidable manual SG 223 0.1665 0.62 0.5
--.CKI.Z. 1987-04-08T10:13:31.00 10.0 undecidable manual PG 223 0.1665 -0.58 0.9
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