Earthquake with magnitude of ML 1.0 on date 31-08-2021 and time 00:29:11 (Italy) in region 1 km NW Savignone (GE)

A magnitude ML 1.0 earthquake occured in region: 1 km NW Savignone (GE), on

  • 30-08-2021 22:29:11 (UTC)
  • 31-08-2021 00:29:11 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.5700, 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.

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
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 7 798 18084
Mignanego GE 7 3675 21759
Montoggio GE 8 2067 23826
Serra Riccò GE 8 7885 31711
Isola del Cantone GE 9 1540 33251
Fraconalto AL 9 336 33587
Sant'Olcese GE 10 5906 39493
Mongiardino Ligure AL 10 165 39658
Campomorone GE 10 6996 46654
Ceranesi GE 10 3875 50529
Roccaforte Ligure AL 13 136 50665
Voltaggio AL 13 738 51403
Davagna GE 14 1884 53287
Grondona AL 14 510 53797
Cabella Ligure AL 15 528 54325
Torriglia GE 15 2311 56636
Arquata Scrivia AL 15 6409 63045
Carrosio AL 16 510 63555
Propata GE 16 142 63697
Rocchetta Ligure AL 16 200 63897
Albera Ligure AL 16 325 64222
Bargagli GE 16 2708 66930
Carrega Ligure AL 16 84 67014
Vignole Borbera AL 17 2182 69196
Cantalupo Ligure AL 17 527 69723
Bosio AL 18 1227 70950
Genova GE 18 586655 657605
Borghetto di Borbera AL 18 1966 659571
Rondanina GE 18 62 659633
Lumarzo GE 18 1535 661168
Serravalle Scrivia AL 20 6128 667296
Gavi AL 20 4614 671910
Mornese AL 20 737 672647
Fascia GE 20 81 672728
Stazzano AL 20 2486 675214

Municipalities with at least 50000 inhabitants

An earthquake occurred to
18 Km N of Genova (586655 inhabitants)
48 Km SE of Alessandria (93943 inhabitants)
50 Km NE of Savona (61345 inhabitants)
70 Km S of Pavia (72576 inhabitants)
72 Km SE of Asti (76202 inhabitants)
77 Km SW of Piacenza (102191 inhabitants)
84 Km S of Vigevano (63310 inhabitants)
85 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 1.0 2021-08-30
22:29:11
44.57 8.9863 10 2021-12-29
11:12:31
Bollettino Sismico Italiano INGV 95657241
Reviewed
Rev100
ML 1.8 2021-08-30
22:29:11
44.6018 8.96 1 2021-08-30
22:36:21
Sala Sismica INGV-Roma 94837621
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-30 22:29:11 ± 0.11
Latitude 44.5700 ± 0.0081
Longitude 8.9863 ± 0.0063
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 95657241

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 967
Semi-minor axis of confidence ellipse (meter) 341
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 161
Circular confidence region, given by single value of horizontal uncertainty (meter) 970.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 175
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0.10162
Epicentral distance of station farthest from the epicenter (degree) 0.51891
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitudes information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.5
Num. used stations 12
Type of magnitude ML
Reference to an origin 95657241
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-17 14:32:44

ML:1.8

Field Value
Value 1.8
Uncertainty 0.4
Num. used stations 6
Type of magnitude ML
Reference to an origin 94837621
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-30 22:36:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MSSA.HHZ. 2021-08-30T22:29:27.02 0.6 undecidable manual S 124 50.616 50 -0.33 44
IV.QLNO.HHE. 2021-08-30T22:29:22.00 0.3 undecidable manual P 242 57.5979 50 0.41 64
GU.PCP.HHZ. 2021-08-30T22:29:22.96 0.6 undecidable manual S 265 35.0427 50 -0.23 46
GU.GORR.HHZ. 2021-08-30T22:29:20.32 0.6 undecidable manual S 80 24.5532 112 -0.03 49
IV.MSSA.HHZ. 2021-08-30T22:29:20.79 0.3 undecidable manual P 124 50.616 50 0.28 67
IT.GNV.HGE. 2021-08-30T22:29:17.79 0.6 undecidable manual S 196 15.9729 122 0.1 49
GU.PCP.HHZ. 2021-08-30T22:29:17.95 0.1 negative manual P 265 35.0427 50 -0.15 94
GU.RNCA.HHZ. 2021-08-30T22:29:16.09 0.6 undecidable manual S 194 11.2776 132 -0.31 47
GU.GORR.HHZ. 2021-08-30T22:29:16.45 0.1 undecidable manual P 80 24.5532 112 -0.01 98
IT.GNV.HGE. 2021-08-30T22:29:15.00 0.3 undecidable manual P 196 15.9729 122 0.07 74
GU.RNCA.HHZ. 2021-08-30T22:29:14.22 0.1 positive manual P 194 11.2776 132 0.04 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.RNCA.HHE. ML:0.5 0.000040517255 0.1408 AML other m 2021-08-30T22:29:16.28
GU.RNCA.HHN. ML:0.6 0.00004745803 0.1024 AML other m 2021-08-30T22:29:16.59
GU.GORR.HHN. ML:0.8 0.00003675 0.6 AML other m 2021-08-30T22:29:21.56
GU.GORR.HHE. ML:0.9 0.000051699999999999996 0.46 AML other m 2021-08-30T22:29:22.31
GU.PCP.HHE. ML:0.6 0.000012956825 1.536 AML other m 2021-08-30T22:29:23.36
GU.PCP.HHN. ML:0.1 0.000006747504199999999 0.2304 AML other m 2021-08-30T22:29:22.97
IV.SARZ.HNE. ML:2.0 0.0004095 0.2 AML other m 2021-08-30T22:29:26.87
IV.SARZ.HHE. ML:2.1 0.00048699999999999997 0.06 AML other m 2021-08-30T22:29:26.87
IV.SARZ.HHN. ML:2.0 0.000478 0.06 AML other m 2021-08-30T22:29:26.91
IV.SARZ.HNN. ML:2.0 0.000395 0.32 AML other m 2021-08-30T22:29:26.92
IV.MSSA.HHE. ML:1.1 0.000031382850000000004 0.0896 AML other m 2021-08-30T22:29:28.06
IV.MSSA.HHN. ML:1.1 0.000030448455 0.0768 AML other m 2021-08-30T22:29:28.04
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