Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 30-09-2021 and time 02:02:52 (Italy) in region 1 km SE Savignone (GE)

A magnitude ML 1.9 earthquake occured in region: 1 km SE Savignone (GE), on

  • 30-09-2021 00:02:52 (UTC)
  • 30-09-2021 02:02:52 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.5550, 9.0000 at 8 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
Savignone GE 1 3205 3205
Casella GE 2 3144 6349
Crocefieschi GE 4 548 6897
Busalla GE 5 5563 12460
Valbrevenna GE 5 798 13258
Montoggio GE 6 2067 15325
Vobbia GE 6 409 15734
Ronco Scrivia GE 7 4417 20151
Serra Riccò GE 7 7885 28036
Mignanego GE 7 3675 31711
Sant'Olcese GE 8 5906 37617
Campomorone GE 10 6996 44613
Ceranesi GE 10 3875 48488
Fraconalto AL 10 336 48824
Mongiardino Ligure AL 11 165 48989
Isola del Cantone GE 11 1540 50529
Davagna GE 12 1884 52413
Torriglia GE 13 2311 54724
Roccaforte Ligure AL 14 136 54860
Bargagli GE 14 2708 57568
Voltaggio AL 14 738 58306
Propata GE 15 142 58448
Cabella Ligure AL 15 528 58976
Carrega Ligure AL 16 84 59060
Grondona AL 16 510 59570
Lumarzo GE 17 1535 61105
Genova GE 17 586655 647760
Albera Ligure AL 17 325 648085
Arquata Scrivia AL 17 6409 654494
Rocchetta Ligure AL 17 200 654694
Rondanina GE 17 62 654756
Carrosio AL 18 510 655266
Cantalupo Ligure AL 19 527 655793
Fascia GE 19 81 655874
Neirone GE 19 916 656790
Vignole Borbera AL 19 2182 658972
Bosio AL 19 1227 660199

Municipalities with at least 50000 inhabitants

An earthquake occurred to
17 Km NE of Genova (586655 inhabitants)
49 Km NE of Savona (61345 inhabitants)
50 Km SE of Alessandria (93943 inhabitants)
71 Km S of Pavia (72576 inhabitants)
74 Km SE of Asti (76202 inhabitants)
78 Km SW of Piacenza (102191 inhabitants)
83 Km NW of La Spezia (93959 inhabitants)
86 Km S of Vigevano (63310 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 1.9 2021-09-30
00:02:52		 44.5552 8.9997 8 2022-03-30
13:04:08		 Bollettino Sismico Italiano INGV 96205381
Reviewed
Rev100 		ML 1.8 2021-09-30
00:02:52		 44.5472 9.0057 8 2021-09-30
00:13:32		 Sala Sismica INGV-Roma 96048001
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-30 00:02:52 ± 0.09
Latitude 44.5552 ± 0.0063
Longitude 8.9997 ± 0.0063
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 96205381

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 653
Semi-minor axis of confidence ellipse (meter) 378
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 160
Circular confidence region, given by single value of horizontal uncertainty (meter) 650.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 67
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.29
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.91101
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 15
Magnitudes information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 96205381
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-04 12:48:39

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 96048001
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-30 00:13:32
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PE3.EHZ. 2021-09-30T00:04:10.03 3.0 undecidable manual Sn 2.42 0
IV.LPEL.HHZ. 2021-09-30T00:04:07.85 3.0 undecidable manual Pn 7.41 0
TV.SF04.EHZ. 2021-09-30T00:04:05.62 3.0 undecidable manual Sn 0.11 0
IV.NDIM.HHZ. 2021-09-30T00:03:22.65 3.0 negative manual P 5.14 0
GU.EQUI.HHZ. 2021-09-30T00:03:22.78 0.6 undecidable manual S 115 101.121 50 -0.17 41
GU.RORO.HHE. 2021-09-30T00:03:19.97 0.3 undecidable manual S 237 88.8444 50 0.31 61
GU.GRAM.HHZ. 2021-09-30T00:03:18.79 0.6 undecidable manual S 94 84.5487 50 0.27 41
GU.CANO.HHZ. 2021-09-30T00:03:15.39 0.3 undecidable manual S 238 71.6727 50 0.3 63
GU.EQUI.HHZ. 2021-09-30T00:03:10.60 0.3 undecidable manual P 115 101.121 50 0.36 59
IV.MSSA.HHZ. 2021-09-30T00:03:08.37 0.3 undecidable manual S 123 48.8178 50 -0.61 60
IV.PLMA.HHE. 2021-09-30T00:03:08.56 0.6 undecidable manual P 129 87.9453 50 0.35 40
GU.RORO.HHE. 2021-09-30T00:03:08.01 0.3 undecidable manual P 237 88.8444 50 -0.34 61
GU.GRAM.HHZ. 2021-09-30T00:03:08.08 0.3 undecidable manual P 94 84.5487 50 0.39 60
IV.BOB.HNE. 2021-09-30T00:03:07.75 0.3 undecidable manual S 56 42.5241 50 0.45 43
GU.CANO.HHZ. 2021-09-30T00:03:05.42 0.6 undecidable manual P 238 71.6727 50 -0.29 42
IV.SARZ.HHZ. 2021-09-30T00:03:05.62 0.6 undecidable manual S 349 35.2425 50 0.25 45
IV.QLNO.HHE. 2021-09-30T00:03:03.10 0.3 undecidable manual P 244 57.7977 50 -0.46 63
GU.ROTM.HHZ. 2021-09-30T00:03:03.87 0.3 undecidable manual P 303 60.5949 50 -0.12 67
GU.GORR.HHZ. 2021-09-30T00:03:01.33 0.3 undecidable manual S 76 23.8539 109 -0.32 69
IV.MSSA.HHZ. 2021-09-30T00:03:01.93 0.3 undecidable manual P 123 48.8178 50 -0.25 67
IV.BOB.HNE. 2021-09-30T00:03:01.42 0.1 undecidable manual P 56 42.5241 50 0.21 90
IV.SARZ.HHZ. 2021-09-30T00:03:00.52 0.3 undecidable manual P 349 35.2425 50 0.43 66
GU.PCP.HHZ. 2021-09-30T00:02:59.41 0.1 negative manual P 268 35.9418 50 -0.78 77
GU.GENL.EHN. 2021-09-30T00:02:59.63 0.3 undecidable manual S 188 16.7721 116 0.26 70
IT.GNV.HGE. 2021-09-30T00:02:58.91 0.6 undecidable manual S 201 14.6742 119 0.17 48
GU.GORR.HHZ. 2021-09-30T00:02:57.67 0.1 undecidable manual P 76 23.8539 109 -0.27 92
GU.RNCA.HHZ. 2021-09-30T00:02:57.42 0.1 undecidable manual S 202 10.0788 130 0 100
GU.GENL.EHN. 2021-09-30T00:02:56.74 0.3 undecidable manual P 188 16.7721 116 0.11 73
IT.GNV.HGE. 2021-09-30T00:02:56.38 0.1 undecidable manual P 201 14.6742 119 0.11 97
GU.RNCA.HHZ. 2021-09-30T00:02:55.57 0.1 undecidable manual P 202 10.0788 130 0.07 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.RNCA.HHE. ML:1.9 0.0010625 0.14 AML other m 2021-09-30T00:02:57.46
GU.RNCA.HHN. ML:2.0 0.0013399999999999998 0.14 AML other m 2021-09-30T00:02:57.93
GU.GORR.HHE. ML:1.7 0.00032299999999999994 0.58 AML other m 2021-09-30T00:03:02.30
GU.GORR.HHN. ML:1.7 0.0003285 0.96 AML other m 2021-09-30T00:03:03.61
IV.MSSA.HHE. ML:2.1 0.0003445 0.1 AML other m 2021-09-30T00:03:09.33
IV.SARZ.HHE. ML:1.7 0.000194 1.26 AML other m 2021-09-30T00:03:09.80
IV.MSSA.HHN. ML:2.0 0.0002415 0.1 AML other m 2021-09-30T00:03:10.29
IV.SARZ.HHN. ML:1.8 0.0002385 1.14 AML other m 2021-09-30T00:03:10.67
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