Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.6 on date 20-09-2020 and time 02:44:27 (UTC) in region 3 km N Gavi (AL)

A magnitude ML 0.6 earthquake occured in region: 3 km N Gavi (AL), on

  • 20-09-2020 02:44:27 (UTC)
  • 20-09-2020 04:44:27 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.7190, 8.8150 at 17 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
Gavi AL 3 4614 4614
Serravalle Scrivia AL 4 6128 10742
Tassarolo AL 4 672 11414
Stazzano AL 4 2486 13900
Novi Ligure AL 5 28154 42054
San Cristoforo AL 6 608 42662
Vignole Borbera AL 6 2182 44844
Pasturana AL 6 1318 46162
Cassano Spinola AL 7 1731 47893
Arquata Scrivia AL 7 6409 54302
Carrosio AL 7 510 54812
Francavilla Bisio AL 7 531 55343
Parodi Ligure AL 7 715 56058
Bosio AL 8 1227 57285
Sardigliano AL 9 406 57691
Gavazzana AL 9 180 57871
Montaldeo AL 9 265 58136
Pozzolo Formigaro AL 9 4775 62911
Castelletto d'Orba AL 10 2047 64958
Mornese AL 10 737 65695
Capriata d'Orba AL 10 1904 67599
Basaluzzo AL 10 2087 69686
Borghetto di Borbera AL 11 1966 71652
Voltaggio AL 11 738 72390
Sant'Agata Fossili AL 11 425 72815
Casaleggio Boiro AL 11 372 73187
Villalvernia AL 12 955 74142
Silvano d'Orba AL 12 1988 76130
Carezzano AL 12 431 76561
Grondona AL 12 510 77071
Lerma AL 12 869 77940
Fresonara AL 13 731 78671
Predosa AL 13 2048 80719
Paderna AL 13 220 80939
Castellania AL 13 90 81029
Isola del Cantone GE 14 1540 82569
Rocca Grimalda AL 14 1512 84081
Spineto Scrivia AL 14 337 84418
Costa Vescovato AL 14 335 84753
Tagliolo Monferrato AL 15 1581 86334
Fraconalto AL 15 336 86670
Avolasca AL 15 294 86964
Carbonara Scrivia AL 15 1122 88086
Villaromagnano AL 16 715 88801
Belforte Monferrato AL 16 515 89316
Bosco Marengo AL 16 2457 91773
Ovada AL 16 11477 103250
Garbagna AL 16 696 103946
Ronco Scrivia GE 17 4417 108363
Cerreto Grue AL 17 323 108686
Carpeneto AL 17 977 109663
Frugarolo AL 17 1968 111631
Montegioco AL 17 313 111944
Roccaforte Ligure AL 18 136 112080
Cantalupo Ligure AL 18 527 112607
Montaldo Bormida AL 18 664 113271
Sarezzano AL 19 1171 114442
Rocchetta Ligure AL 19 200 114642
Trisobbio AL 19 655 115297
Busalla GE 19 5563 120860
Casasco AL 20 129 120989
Dernice AL 20 185 121174
Tortona AL 20 27437 148611

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km SE of Alessandria (93943 inhabitants)
35 Km N of Genova (586655 inhabitants)
52 Km E of Asti (76202 inhabitants)
53 Km NE of Savona (61345 inhabitants)
59 Km SW of Pavia (72576 inhabitants)
67 Km S of Vigevano (63310 inhabitants)
79 Km W of Piacenza (102191 inhabitants)
82 Km S of Novara (104380 inhabitants)
88 Km SW of Milano (1345851 inhabitants)
92 Km S of Rho (50434 inhabitants)
94 Km E of Moncalieri (57294 inhabitants)
97 Km SW of Sesto San Giovanni (81608 inhabitants)
98 Km E of Torino (890529 inhabitants)
98 Km S of Legnano (60262 inhabitants)
99 Km SW of Cinisello Balsamo (75078 inhabitants)
100 Km S of Busto Arsizio (83106 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 		ML 0.6 2020-09-20
02:44:27		 44.7188 8.8148 17 2021-02-26
14:56:10		 Bollettino Sismico Italiano INGV 85342161
Reviewed
Rev100 		ML 0.6 2020-09-20
02:44:27		 44.7147 8.8047 10 2020-09-20
02:55:37		 Sala Sismica INGV-Roma 83042951
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-20 02:44:27 ± 0.18
Latitude 44.7188 ± 0.0117
Longitude 8.8148 ± 0.0165
Depth (km) 17 ± 6 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 85342161

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1560
Semi-minor axis of confidence ellipse (meter) 0
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 136
Circular confidence region, given by single value of horizontal uncertainty (meter) 1560.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 158
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 15
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) 0.16368
Epicentral distance of station farthest from the epicenter (degree) 0.98656
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:0.6

Field Value
Value 0.6
Uncertainty 0.4
Num. used stations 6
Type of magnitude ML
Reference to an origin 85342161
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-12-10 16:19:51

ML:0.6

Field Value
Value 0.6
Uncertainty 0.4
Num. used stations 6
Type of magnitude ML
Reference to an origin 83042951
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-20 02:55:37
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.RORO.HHE. 2020-09-20T02:44:55.05 0.6 undecidable manual S 222 89.7435 95 0.65 51
GU.CANO.HHE. 2020-09-20T02:44:50.04 0.6 undecidable manual S 219 72.8715 96 0.12 61
GU.MGRO.HHZ. 2020-09-20T02:44:47.23 0.3 undecidable manual P 227 109.5126 94 0.97 65
IV.QLNO.HHE. 2020-09-20T02:44:45.62 0.6 undecidable manual S 220 57.3981 98 -0.19 63
GU.RORO.HHE. 2020-09-20T02:44:43.18 0.3 undecidable manual P 222 89.7435 95 -0.03 90
GU.CANO.HHE. 2020-09-20T02:44:40.53 0.6 undecidable manual P 219 72.8715 96 -0.1 61
GU.GORR.HHE. 2020-09-20T02:44:40.74 0.6 undecidable manual S 108 39.7269 103 -0.43 57
GU.RNCA.HHZ. 2020-09-20T02:44:39.05 0.6 undecidable manual S 159 29.5482 109 0.49 62
GU.PCP.HHZ. 2020-09-20T02:44:38.15 0.6 undecidable manual S 227 28.9488 110 -0.28 68
IV.QLNO.HHE. 2020-09-20T02:44:37.75 0.3 undecidable manual P 220 57.3981 98 -0.51 87
IV.SARZ.HHZ. 2020-09-20T02:44:36.56 0.6 undecidable manual S 25 18.1707 124 0.71 43
GU.GORR.HHE. 2020-09-20T02:44:35.34 0.3 undecidable manual P 108 39.7269 103 -0.23 92
GU.PCP.HHZ. 2020-09-20T02:44:33.28 0.3 undecidable manual P 227 28.9488 110 -0.71 89
GU.RNCA.HHZ. 2020-09-20T02:44:33.73 0.3 undecidable manual P 159 29.5482 109 -0.34 93
IV.SARZ.HHZ. 2020-09-20T02:44:31.98 0.3 undecidable manual P 25 18.1707 124 -0.52 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SARZ.HNN. ML:1.4 0.00015440864999999998 0.72 AML other m 2020-09-20T02:44:38.23
GU.PCP.HHN. ML:0.5 0.00001268650475 0.16 AML other m 2020-09-20T02:44:38.35
GU.PCP.HHE. ML:0.5 0.0000169260715 0.36 AML other m 2020-09-20T02:44:38.55
GU.RNCA.HHN. ML:0.4 0.000010777949 0.32 AML other m 2020-09-20T02:44:39.15
GU.RNCA.HHE. ML:0.5 0.000015192855 1.72 AML other m 2020-09-20T02:44:39.00
IV.SARZ.HNE. ML:1.3 0.000120502865 1.36 AML other m 2020-09-20T02:44:40.73
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