Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 30-08-2021 and time 11:39:44 (Italy) in region Savignone (GE)

A magnitude ML 1.1 earthquake occured in region: Savignone (GE), on

  • 30-08-2021 09:39:44 (UTC)
  • 30-08-2021 11:39:44 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.5680, 8.9870 at 9 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 0 3205 3205
Busalla GE 3 5563 8768
Crocefieschi GE 4 548 9316
Casella GE 4 3144 12460
Ronco Scrivia GE 5 4417 16877
Vobbia GE 6 409 17286
Valbrevenna GE 6 798 18084
Mignanego GE 7 3675 21759
Montoggio GE 7 2067 23826
Serra Riccò GE 8 7885 31711
Fraconalto AL 9 336 32047
Isola del Cantone GE 9 1540 33587
Sant'Olcese GE 9 5906 39493
Mongiardino Ligure AL 10 165 39658
Campomorone GE 10 6996 46654
Ceranesi GE 10 3875 50529
Voltaggio AL 13 738 51267
Roccaforte Ligure AL 13 136 51403
Davagna GE 14 1884 53287
Torriglia GE 15 2311 55598
Grondona AL 15 510 56108
Cabella Ligure AL 15 528 56636
Arquata Scrivia AL 16 6409 63045
Propata GE 16 142 63187
Bargagli GE 16 2708 65895
Carrosio AL 16 510 66405
Carrega Ligure AL 16 84 66489
Rocchetta Ligure AL 16 200 66689
Albera Ligure AL 16 325 67014
Cantalupo Ligure AL 18 527 67541
Vignole Borbera AL 18 2182 69723
Genova GE 18 586655 656378
Bosio AL 18 1227 657605
Lumarzo GE 18 1535 659140
Rondanina GE 18 62 659202
Borghetto di Borbera AL 19 1966 661168
Serravalle Scrivia AL 20 6128 667296
Gavi AL 20 4614 671910
Fascia GE 20 81 671991
Mornese AL 20 737 672728

Municipalities with at least 50000 inhabitants

An earthquake occurred to
18 Km N of Genova (586655 inhabitants)
48 Km SE of Alessandria (93943 inhabitants)
49 Km NE of Savona (61345 inhabitants)
70 Km S of Pavia (72576 inhabitants)
72 Km SE of Asti (76202 inhabitants)
78 Km SW of Piacenza (102191 inhabitants)
84 Km S of Vigevano (63310 inhabitants)
84 Km NW of La Spezia (93959 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 1.1 2021-08-30
09:39:44		 44.5677 8.9872 9 2021-12-29
11:12:29		 Bollettino Sismico Italiano INGV 95261511
Reviewed
Rev100 		ML 1.5 2021-08-30
09:39:44		 44.5677 8.9842 10 2021-08-30
09:46:54		 Sala Sismica INGV-Roma 94814231
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-30 09:39:44 ± 0.24
Latitude 44.5677 ± 0.0153
Longitude 8.9872 ± 0.0164
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 95261511

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1917
Semi-minor axis of confidence ellipse (meter) 787
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 151
Circular confidence region, given by single value of horizontal uncertainty (meter) 1920.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 153
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.38
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.45416
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 6
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.0
Num. used stations 2
Type of magnitude ML
Reference to an origin 94814231
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-30 09:46:54

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 95261511
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-14 16:17:37
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IT.RMMM.HGZ. 2021-08-30T09:41:44.75 3.0 undecidable manual Sg 10.36 0
IV.RM33.HNZ. 2021-08-30T09:41:40.72 3.0 undecidable manual Sg 5.63 0
IV.MRLC.HHZ. 2021-08-30T09:41:38.75 3.0 undecidable manual Pg 17.42 0
IV.COR1.EHZ. 2021-08-30T09:41:28.45 3.0 undecidable manual Sg 10.08 0
IV.GAVE.EHZ. 2021-08-30T09:41:25.21 3.0 undecidable manual Sn -2.56 0
IV.MTMR.EHZ. 2021-08-30T09:41:23.74 3.0 undecidable manual Pg 7.7 0
CR.ZAG.BHZ. 2021-08-30T09:41:22.12 3.0 undecidable manual Pg 16.219999 0
IV.ARVD.HHZ. 2021-08-30T09:41:17.71 3.0 undecidable manual Sn -0.95 0
IT.LRNO.HNZ. 2021-08-30T09:41:09.48 3.0 undecidable manual Pn 1.73 0
IT.PLTA.HNZ. 2021-08-30T09:41:02.07 3.0 undecidable manual Pn -3.95 0
IV.LAV9.HHZ. 2021-08-30T09:40:47.35 3.0 negative manual Pn -4.41 0
GU.LSD.HHZ. 2021-08-30T09:40:40.41 3.0 undecidable manual Sg 4.17 0
GU.RRL.HHZ. 2021-08-30T09:40:39.37 3.0 undecidable manual Sg 1.83 0
IV.ATMI.HHZ. 2021-08-30T09:40:37.67 3.0 negative manual Pg 3.94 0
IV.MBAL.EHZ. 2021-08-30T09:40:37.48 3.0 undecidable manual Sn -5.72 0
MN.BNI.HHZ. 2021-08-30T09:40:22.15 3.0 negative manual Pg 5.15 0
IV.CAPR.HNZ. 2021-08-30T09:40:07.47 3.0 undecidable manual P -4.14 0
IV.CADC.EHZ. 2021-08-30T09:40:07.62 3.0 negative manual P -3.55 0
IV.MSSA.HHZ. 2021-08-30T09:40:00.31 0.6 undecidable manual S 123 50.4162 50 -0.76 39
IV.MSSA.HHZ. 2021-08-30T09:39:54.81 0.3 undecidable manual P 123 50.4162 50 0.67 61
IV.BOB.HNE. 2021-08-30T09:39:53.44 0.3 undecidable manual P 58 42.624 50 0.51 65
GU.GORR.HHZ. 2021-08-30T09:39:53.50 0.6 undecidable manual S 80 24.5532 110 -0.22 48
GU.PCP.HHZ. 2021-08-30T09:39:51.35 0.3 undecidable manual P 265 35.0427 50 -0.42 68
IT.GNV.HGZ. 2021-08-30T09:39:51.19 0.6 undecidable manual S 196 15.6732 120 0.26 48
GU.RNCA.HHZ. 2021-08-30T09:39:49.52 0.3 undecidable manual S 195 11.0778 129 -0.08 76
GU.GORR.HHZ. 2021-08-30T09:39:49.72 0.1 undecidable manual P 80 24.5532 110 -0.18 97
IT.GNV.HGZ. 2021-08-30T09:39:48.18 0.3 undecidable manual P 196 15.6732 120 -0.11 75
GU.RNCA.HHZ. 2021-08-30T09:39:47.65 0.1 positive manual P 195 11.0778 129 0.13 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.RNCA.HHE. ML:1.0 0.00011907279000000002 0.16 AML other m 2021-08-30T09:39:49.56
GU.RNCA.HHN. ML:0.8 0.000084863405 0.16 AML other m 2021-08-30T09:39:50.12
GU.GORR.HHN. ML:0.9 0.00004748231 0.16 AML other m 2021-08-30T09:39:54.19
GU.GORR.HHE. ML:1.1 0.00007798947000000001 0.1408 AML other m 2021-08-30T09:39:54.66
IV.MSSA.HHN. ML:1.4 0.00007105 0.54 AML other m 2021-08-30T09:40:01.36
IV.MSSA.HHE. ML:1.5 0.00007785000000000001 0.1 AML other m 2021-08-30T09:40:01.69
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