Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.1 on date 28-08-2021 and time 18:30:47 (UTC) in region 2 km W Casella (GE)

A magnitude ML 2.1 earthquake occured in region: 2 km W Casella (GE), on

  • 28-08-2021 18:30:47 (UTC)
  • 28-08-2021 20:30:47 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.5420, 8.9800 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
Casella GE 2 3144 3144
Savignone GE 3 3205 6349
Busalla GE 4 5563 11912
Serra Riccò GE 5 7885 19797
Mignanego GE 5 3675 23472
Montoggio GE 6 2067 25539
Crocefieschi GE 6 548 26087
Sant'Olcese GE 6 5906 31993
Valbrevenna GE 7 798 32791
Ronco Scrivia GE 8 4417 37208
Campomorone GE 8 6996 44204
Ceranesi GE 8 3875 48079
Vobbia GE 8 409 48488
Fraconalto AL 10 336 48824
Isola del Cantone GE 12 1540 50364
Davagna GE 12 1884 52248
Mongiardino Ligure AL 13 165 52413
Bargagli GE 14 2708 55121
Voltaggio AL 14 738 55859
Torriglia GE 14 2311 58170
Genova GE 15 586655 644825
Roccaforte Ligure AL 16 136 644961
Lumarzo GE 17 1535 646496
Propata GE 17 142 646638
Grondona AL 17 510 647148
Cabella Ligure AL 17 528 647676
Carrosio AL 18 510 648186
Arquata Scrivia AL 18 6409 654595
Carrega Ligure AL 18 84 654679
Bosio AL 19 1227 655906
Rondanina GE 19 62 655968
Albera Ligure AL 19 325 656293
Rocchetta Ligure AL 19 200 656493
Neirone GE 19 916 657409
Bogliasco GE 20 4488 661897
Vignole Borbera AL 20 2182 664079

Municipalities with at least 50000 inhabitants

An earthquake occurred to
15 Km N of Genova (586655 inhabitants)
47 Km NE of Savona (61345 inhabitants)
50 Km SE of Alessandria (93943 inhabitants)
73 Km SE of Asti (76202 inhabitants)
73 Km S of Pavia (72576 inhabitants)
80 Km SW of Piacenza (102191 inhabitants)
83 Km NW of La Spezia (93959 inhabitants)
87 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 2.1 2021-08-28
18:30:47		 44.5418 8.9795 10 2021-12-29
11:12:34		 Bollettino Sismico Italiano INGV 96110711
Reviewed
Rev100 		ML 2.1 2021-08-28
18:30:47		 44.5395 9.0013 9 2021-08-28
18:51:39		 Sala Sismica INGV-Roma 94762731
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-28 18:30:47 ± 0.14
Latitude 44.5418 ± 0.0117
Longitude 8.9795 ± 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 96110711

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1245
Semi-minor axis of confidence ellipse (meter) 717
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 177
Circular confidence region, given by single value of horizontal uncertainty (meter) 1250.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 55
Number of associated phases, regardless of their use for origin computation 41
Number of defining phases 31
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.37
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.69432
Number of stations at which the event was observed 33
Number of stations from which data was used for origin computation 24
Magnitudes information

ML:2.1

Field Value
Value 2.1
Uncertainty 0.2
Num. used stations 38
Type of magnitude ML
Reference to an origin 94762731
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-28 18:51:39

ML:2.1

Field Value
Value 2.1
Uncertainty 0.3
Num. used stations 44
Type of magnitude ML
Reference to an origin 96110711
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-04 19:08:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IX.SCL3.EHZ.02 2021-08-28T18:32:18.33 3.0 positive manual Pn -0.97 0
IV.PE3.EHZ. 2021-08-28T18:32:18.75 3.0 undecidable manual Sg 13.6 0
IV.MURB.HHZ. 2021-08-28T18:32:14.86 3.0 undecidable manual Sn 5.01 0
IV.PAOL.HHZ. 2021-08-28T18:32:12.79 3.0 undecidable manual Pn 3.94 0
IV.FAGN.HHZ. 2021-08-28T18:32:02.96 3.0 undecidable manual Pg 12.67 0
IV.AGLI.HHZ. 2021-08-28T18:31:38.26 3.0 undecidable manual Pn -2.95 0
IV.MURB.HHZ. 2021-08-28T18:31:34.28 3.0 undecidable manual Pn 0.31 0
IV.IMOL.HNZ. 2021-08-28T18:31:27.18 3.0 positive manual Pg 5.21 0
IV.BRSN.EHZ. 2021-08-28T18:31:26.34 3.0 undecidable manual Pn 0.94 0
IT.FIE.HGZ. 2021-08-28T18:31:21.86 3.0 undecidable manual Pn 2.21 0
IV.MAGA.HHZ. 2021-08-28T18:31:19.78 0.3 undecidable manual P 43 188.0673 38 1.73 23
GU.POPM.HHZ. 2021-08-28T18:31:14.15 0.3 undecidable manual P 111 151.5372 50 1.38 35
GU.TRAV.HHZ. 2021-08-28T18:31:12.27 1.0 undecidable manual P 319 144.6441 50 0.55 17
GU.PZZ.HHZ. 2021-08-28T18:31:12.41 0.3 undecidable manual P 269 147.4413 50 0.26 55
GU.MAIM.HHZ. 2021-08-28T18:31:11.19 0.6 undecidable manual P 120 138.9609 50 0.35 37
GU.BHB.HHZ. 2021-08-28T18:31:11.08 0.3 undecidable manual P 284 139.2606 50 0.2 57
IV.VARE.HHZ. 2021-08-28T18:31:11.84 1.0 undecidable manual P 354 147.9408 50 -0.38 18
GU.STV.HHZ. 2021-08-28T18:31:10.63 0.3 undecidable manual P 256 135.0648 50 0.39 55
FR.SAOF.HHZ.00 2021-08-28T18:31:09.68 0.3 undecidable manual P 242 128.9709 50 0.37 56
GU.ENR.HHZ. 2021-08-28T18:31:09.35 0.3 undecidable manual P 255 128.5713 50 0.12 59
GU.EQUI.HHZ. 2021-08-28T18:31:05.47 0.3 undecidable manual P 114 102.0201 50 0.33 60
GU.GBOS.HHZ. 2021-08-28T18:31:04.13 0.6 undecidable manual P 250 96.2259 50 -0.13 42
IV.PLMA.HHZ. 2021-08-28T18:31:03.45 0.3 undecidable manual P 128 88.3449 50 0.42 60
GU.RORO.HHZ. 2021-08-28T18:31:02.60 0.6 undecidable manual P 237 86.6466 50 -0.18 42
IV.BOB.HHE. 2021-08-28T18:31:02.50 0.6 undecidable manual S 56 44.622 50 0.04 47
IV.SARZ.HHZ. 2021-08-28T18:31:00.73 1.0 undecidable manual S 352 36.4413 50 0.45 22
GU.PCP.HHN. 2021-08-28T18:30:59.00 0.6 undecidable manual S 270 34.3434 50 -0.7 40
GU.ROTM.HHZ. 2021-08-28T18:30:58.85 0.6 undecidable manual P 305 60.0954 50 0.17 45
IV.QLNO.HHZ. 2021-08-28T18:30:57.60 0.1 undecidable manual P 245 55.6998 50 -0.41 86
GU.GORR.HHZ. 2021-08-28T18:30:56.33 0.3 undecidable manual S 74 25.752 50 -1.09 52
IV.BOB.HHE. 2021-08-28T18:30:56.19 0.3 undecidable manual P 56 44.622 50 -0.12 70
IV.MSSA.HHZ. 2021-08-28T18:30:56.80 0.3 undecidable manual P 120 49.4172 50 -0.24 67
IV.SARZ.HHZ. 2021-08-28T18:30:55.41 0.3 undecidable manual P 352 36.4413 50 0.36 67
GU.PCP.HHN. 2021-08-28T18:30:54.06 0.3 undecidable manual P 270 34.3434 50 -0.65 62
GU.GENL.EHZ. 2021-08-28T18:30:54.25 0.3 undecidable manual S 183 15.1737 124 0.01 75
IT.GNV.HGZ. 2021-08-28T18:30:53.84 0.3 undecidable manual S 197 12.7761 129 0.26 72
GU.GORR.HHZ. 2021-08-28T18:30:52.54 0.3 undecidable manual P 74 25.752 50 -0.86 58
GU.RNCA.HHZ. 2021-08-28T18:30:52.26 0.6 undecidable manual S 196 8.1807 141 -0.19 49
GU.GENL.EHZ. 2021-08-28T18:30:51.54 0.1 positive manual P 183 15.1737 124 -0.02 100
IT.GNV.HGZ. 2021-08-28T18:30:51.12 0.1 undecidable manual P 197 12.7761 129 -0.07 100
GU.RNCA.HHZ. 2021-08-28T18:30:50.30 0.1 undecidable manual P 196 8.1807 141 -0.23 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.RNCA.HHN. ML:2.2 0.0019774099999999998 0.1024 AML other m 2021-08-28T18:30:52.80
GU.RNCA.HHE. ML:2.2 0.0020099999999999996 1.84 AML other m 2021-08-28T18:30:53.96
GU.PCP.HHE. ML:1.6 0.0001802755 0.1664 AML other m 2021-08-28T18:30:54.12
GU.GENL.EHE. ML:2.0 0.001047 0.2 AML other m 2021-08-28T18:30:54.68
GU.GENL.EHN. ML:2.1 0.001185 0.12 AML other m 2021-08-28T18:30:55.42
GU.PCP.HHN. ML:1.8 0.0002515 0.2 AML other m 2021-08-28T18:31:00.77
IV.SARZ.HNN. ML:2.4 0.0009501679000000001 0.2944 AML other m 2021-08-28T18:31:03.96
IV.MSSA.HHE. ML:2.8 0.00151 0.1 AML other m 2021-08-28T18:31:04.11
IV.MSSA.HHN. ML:2.7 0.001435 0.1 AML other m 2021-08-28T18:31:04.23
IV.SARZ.HHE. ML:2.5 0.0011850171 0.3584 AML other m 2021-08-28T18:31:05.38
IV.SARZ.HNE. ML:2.5 0.0011932295499999998 0.3584 AML other m 2021-08-28T18:31:05.39
IV.QLNO.HHN. ML:1.9 0.00017605749999999998 0.1408 AML other m 2021-08-28T18:31:08.73
IV.QLNO.HHE. ML:1.8 0.0001623365 0.1664 AML other m 2021-08-28T18:31:09.62
IV.SARZ.HHN. ML:2.4 0.0009557851500000001 0.7808 AML other m 2021-08-28T18:31:10.12
GU.ROTM.HHE. ML:2.3 0.00045162585 0.3328 AML other m 2021-08-28T18:31:11.89
IV.PLMA.HHN. ML:2.1 0.0001624392 0.2176 AML other m 2021-08-28T18:31:15.83
GU.RORO.HHN. ML:2.0 0.000125702725 0.3712 AML other m 2021-08-28T18:31:16.03
IV.PLMA.HHE. ML:2.1 0.00016549999999999998 1.62 AML other m 2021-08-28T18:31:16.86
GU.GBOS.HHN. ML:2.0 0.00011300000000000001 0.38 AML other m 2021-08-28T18:31:19.58
GU.EQUI.HHE. ML:2.0 0.00008430415 0.3584 AML other m 2021-08-28T18:31:19.56
GU.ROTM.HHN. ML:2.4 0.0005859999999999999 0.38 AML other m 2021-08-28T18:31:20.74
GU.EQUI.HHN. ML:2.2 0.00013350000000000002 0.34 AML other m 2021-08-28T18:31:20.57
GU.GBOS.HHE. ML:1.7 0.0000508436 0.4352 AML other m 2021-08-28T18:31:20.49
GU.ENR.HHE. ML:1.8 0.000040437475 0.384 AML other m 2021-08-28T18:31:29.86
GU.ENR.HHN. ML:2.0 0.00006059953 0.384 AML other m 2021-08-28T18:31:29.95
GU.MAIM.HHE. ML:1.9 0.00005075 0.34 AML other m 2021-08-28T18:31:30.49
GU.MAIM.HHN. ML:2.0 0.00006705 0.52 AML other m 2021-08-28T18:31:30.76
FR.SAOF.HHE.00 ML:2.0 0.00007165 0.7 AML other m 2021-08-28T18:31:31.02
GU.BHB.HHE. ML:1.9 0.00004505 1.64 AML other m 2021-08-28T18:31:32.89
FR.SAOF.HHN.00 ML:2.0 0.000060563345 0.5504 AML other m 2021-08-28T18:31:32.16
GU.TRAV.HHE. ML:2.3 0.00010635 0.96 AML other m 2021-08-28T18:31:32.17
GU.TRAV.HHN. ML:2.2 0.00008965 0.26 AML other m 2021-08-28T18:31:32.67
GU.BHB.HNN. ML:1.9 0.00005049646 0.448 AML other m 2021-08-28T18:31:32.55
GU.STV.HHE. ML:1.7 0.000031919829999999994 0.3328 AML other m 2021-08-28T18:31:33.13
GU.POPM.HHE. ML:2.4 0.0001235 0.38 AML other m 2021-08-28T18:31:33.82
GU.STV.HHN. ML:1.7 0.000030328765 0.3584 AML other m 2021-08-28T18:31:34.10
GU.PZZ.HHN. ML:2.1 0.00006785 0.24 AML other m 2021-08-28T18:31:34.58
GU.POPM.HHN. ML:2.4 0.00012757415 0.2816 AML other m 2021-08-28T18:31:34.74
GU.PZZ.HHE. ML:2.1 0.00006735 1.28 AML other m 2021-08-28T18:31:35.81
GU.BHB.HHN. ML:1.8 0.000035464885 0.32 AML other m 2021-08-28T18:31:36.35
IV.VARE.HHE. ML:1.6 0.000019421425 0.6912 AML other m 2021-08-28T18:31:45.19
IV.MAGA.HHN. ML:2.3 0.0000724 0.28 AML other m 2021-08-28T18:31:46.61
IV.MAGA.HHE. ML:2.5 0.00011135 0.48 AML other m 2021-08-28T18:31:49.98
IV.VARE.HHN. ML:1.7 0.000026814205000000002 0.6016 AML other m 2021-08-28T18:31:49.72
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
Waveforms Seismic signals in miniseed + resp format Download