Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 11-10-2021 and time 22:33:39 (UTC) in region 2 km N Savignone (GE)

A magnitude ML 0.8 earthquake occured in region: 2 km N Savignone (GE), on

  • 11-10-2021 22:33:39 (UTC)
  • 12-10-2021 00:33:39 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.5800, 8.9860 at 10 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 2 3205 3205
Crocefieschi GE 3 548 3753
Busalla GE 3 5563 9316
Ronco Scrivia GE 4 4417 13733
Vobbia GE 5 409 14142
Casella GE 5 3144 17286
Valbrevenna GE 7 798 18084
Isola del Cantone GE 8 1540 19624
Mignanego GE 8 3675 23299
Montoggio GE 8 2067 25366
Fraconalto AL 9 336 25702
Serra Riccò GE 9 7885 33587
Mongiardino Ligure AL 9 165 33752
Sant'Olcese GE 11 5906 39658
Campomorone GE 11 6996 46654
Ceranesi GE 11 3875 50529
Roccaforte Ligure AL 12 136 50665
Voltaggio AL 12 738 51403
Grondona AL 13 510 51913
Cabella Ligure AL 14 528 52441
Arquata Scrivia AL 14 6409 58850
Carrosio AL 15 510 59360
Davagna GE 15 1884 61244
Rocchetta Ligure AL 15 200 61444
Albera Ligure AL 15 325 61769
Torriglia GE 15 2311 64080
Carrega Ligure AL 16 84 64164
Propata GE 16 142 64306
Vignole Borbera AL 16 2182 66488
Cantalupo Ligure AL 16 527 67015
Bargagli GE 17 2708 69723
Bosio AL 17 1227 70950
Borghetto di Borbera AL 17 1966 72916
Rondanina GE 19 62 72978
Serravalle Scrivia AL 19 6128 79106
Gavi AL 19 4614 83720
Genova GE 19 586655 670375
Stazzano AL 19 2486 672861
Lumarzo GE 19 1535 674396
Mornese AL 19 737 675133

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km N of Genova (586655 inhabitants)
47 Km SE of Alessandria (93943 inhabitants)
50 Km NE of Savona (61345 inhabitants)
69 Km S of Pavia (72576 inhabitants)
71 Km E of Asti (76202 inhabitants)
77 Km SW of Piacenza (102191 inhabitants)
83 Km S of Vigevano (63310 inhabitants)
85 Km NW of La Spezia (93959 inhabitants)
100 Km S of Milano (1345851 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 0.8 2021-10-11
22:33:39		 44.5795 8.9857 10 2022-03-30
13:04:21		 Bollettino Sismico Italiano INGV 98583201
Reviewed
Rev100 		ML 0.8 2021-10-11
22:33:39		 44.5718 8.9868 9 2021-10-11
22:37:37		 Sala Sismica INGV-Roma 96450471
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-11 22:33:39 ± 0.15
Latitude 44.5795 ± 0.0099
Longitude 8.9857 ± 0.0088
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 98583201

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1100
Semi-minor axis of confidence ellipse (meter) 453
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 157
Circular confidence region, given by single value of horizontal uncertainty (meter) 1100.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 157
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.11152
Epicentral distance of station farthest from the epicenter (degree) 0.46135
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 98583201
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-07 12:10:42

ML:0.8

Field Value
Value 0.8
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 96450471
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-11 22:37:37
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MSSA.HHZ. 2021-10-11T22:33:55.50 0.6 undecidable manual S 125 51.2154 50 -0.38 43
GU.PCP.HHZ. 2021-10-11T22:33:51.60 0.6 undecidable manual S 263 35.0427 50 0.04 48
IV.MSSA.HHZ. 2021-10-11T22:33:48.99 0.3 undecidable manual P 125 51.2154 50 0.06 70
GU.GORR.HHZ. 2021-10-11T22:33:48.50 0.6 undecidable manual S 83 24.4533 112 -0.06 49
IV.BOB.HNE. 2021-10-11T22:33:48.19 0.6 undecidable manual P 60 42.0246 50 0.68 40
GU.GENL.EHN. 2021-10-11T22:33:47.63 0.6 undecidable manual S 184 19.3695 117 0.69 42
GU.PCP.HHZ. 2021-10-11T22:33:46.29 0.1 undecidable manual P 263 35.0427 50 -0.15 94
IT.GNV.HGE. 2021-10-11T22:33:46.40 0.6 undecidable manual S 195 16.9719 120 0.19 48
GU.GORR.HHZ. 2021-10-11T22:33:44.62 0.1 undecidable manual P 83 24.4533 112 -0.09 97
GU.RNCA.HHZ. 2021-10-11T22:33:44.30 0.6 undecidable manual S 193 12.3765 128 -0.58 44
GU.GENL.EHN. 2021-10-11T22:33:43.75 0.3 undecidable manual P 184 19.3695 117 -0.02 74
IT.GNV.HGE. 2021-10-11T22:33:43.36 0.1 undecidable manual P 195 16.9719 120 0.01 100
GU.RNCA.HHZ. 2021-10-11T22:33:42.54 0.1 positive manual P 193 12.3765 128 -0.04 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.RNCA.HHE. ML:0.9 0.00008335 0.8 AML other m 2021-10-11T22:33:44.89
GU.RNCA.HHN. ML:1.0 0.00010334999999999999 1.62 AML other m 2021-10-11T22:33:45.88
GU.GORR.HHN. ML:0.7 0.0000324 0.9 AML other m 2021-10-11T22:33:49.30
GU.GORR.HHE. ML:0.8 0.00003265 0.54 AML other m 2021-10-11T22:33:49.38
GU.PCP.HHE. ML:0.4 0.000009445779 0.8704 AML other m 2021-10-11T22:33:52.70
GU.PCP.HHN. ML:0.4 0.0000094721155 0 AML other m 2021-10-11T22:33:53.32
IV.MSSA.HHE. ML:1.1 0.000028380135000000002 0.1024 AML other m 2021-10-11T22:33:57.22
IV.MSSA.HHN. ML:1.0 0.00002288461 0.1024 AML other m 2021-10-11T22:34:00.03
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