Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.5 on date 27-08-2021 and time 15:47:46 (Italy) in region 1 km NW Casella (GE)

A magnitude ML 2.5 earthquake occured in region: 1 km NW Casella (GE), on

  • 27-08-2021 13:47:46 (UTC)
  • 27-08-2021 15:47:46 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.5390, 8.9950 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

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 1 3144 3144
Savignone GE 3 3205 6349
Montoggio GE 5 2067 8416
Busalla GE 5 5563 13979
Crocefieschi GE 6 548 14527
Serra Riccò GE 6 7885 22412
Valbrevenna GE 6 798 23210
Sant'Olcese GE 6 5906 29116
Mignanego GE 6 3675 32791
Vobbia GE 8 409 33200
Ronco Scrivia GE 8 4417 37617
Campomorone GE 9 6996 44613
Ceranesi GE 9 3875 48488
Fraconalto AL 11 336 48824
Davagna GE 11 1884 50708
Isola del Cantone GE 12 1540 52248
Mongiardino Ligure AL 12 165 52413
Bargagli GE 13 2708 55121
Torriglia GE 13 2311 57432
Genova GE 15 586655 644087
Voltaggio AL 15 738 644825
Propata GE 15 142 644967
Lumarzo GE 16 1535 646502
Roccaforte Ligure AL 16 136 646638
Cabella Ligure AL 17 528 647166
Carrega Ligure AL 17 84 647250
Grondona AL 18 510 647760
Rondanina GE 18 62 647822
Neirone GE 18 916 648738
Arquata Scrivia AL 19 6409 655147
Carrosio AL 19 510 655657
Bogliasco GE 19 4488 660145
Albera Ligure AL 19 325 660470
Rocchetta Ligure AL 19 200 660670
Uscio GE 19 2284 662954
Fascia GE 19 81 663035
Pieve Ligure GE 20 2544 665579

Municipalities with at least 50000 inhabitants

An earthquake occurred to
15 Km NE of Genova (586655 inhabitants)
48 Km NE of Savona (61345 inhabitants)
51 Km SE of Alessandria (93943 inhabitants)
73 Km S of Pavia (72576 inhabitants)
74 Km SE of Asti (76202 inhabitants)
79 Km SW of Piacenza (102191 inhabitants)
82 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 2.5 2021-08-27
13:47:46		 44.5393 8.9947 10 2021-12-29
11:12:28		 Bollettino Sismico Italiano INGV 95236571
Reviewed
Rev100 		ML 2.5 2021-08-27
13:47:46		 44.5713 8.9883 9 2021-08-27
14:01:11		 Sala Sismica INGV-Roma 94709071
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-27 13:47:46 ± 0.11
Latitude 44.5393 ± 0.0081
Longitude 8.9947 ± 0.0076
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 95236571

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 883
Semi-minor axis of confidence ellipse (meter) 534
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 163
Circular confidence region, given by single value of horizontal uncertainty (meter) 880.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 60
Number of associated phases, regardless of their use for origin computation 42
Number of defining phases 42
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) 0.07464
Epicentral distance of station farthest from the epicenter (degree) 2.36342
Number of stations at which the event was observed 28
Number of stations from which data was used for origin computation 28
Magnitudes information

ML:2.5

Field Value
Value 2.5
Uncertainty 0.3
Num. used stations 48
Type of magnitude ML
Reference to an origin 95236571
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-23 11:15:02

ML:2.5

Field Value
Value 2.5
Uncertainty 0.3
Num. used stations 52
Type of magnitude ML
Reference to an origin 94709071
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-27 14:01:11
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.TRAV.HHZ. 2021-08-27T13:48:29.63 0.6 undecidable manual S 318 145.6431 50 1.5 22
CH.BNALP.HHZ. 2021-08-27T13:48:27.44 0.3 undecidable manual P 351 262.3374 38 1.49 16
GU.MAIM.HHZ. 2021-08-27T13:48:25.37 1.0 undecidable manual S 120 137.7621 50 -0.64 17
ST.CARE.HNZ. 2021-08-27T13:48:24.62 0.6 undecidable manual P 32 247.4634 38 0.52 19
GU.CARD.HHZ. 2021-08-27T13:48:23.80 1.0 undecidable manual S 115 131.1687 50 -0.44 18
GU.IMI.HHZ. 2021-08-27T13:48:19.21 1.0 undecidable manual S 232 111.8991 50 0.09 20
IV.MAGA.HHZ. 2021-08-27T13:48:18.40 0.3 undecidable manual P 42 187.4679 38 1.77 22
GU.MGRO.HHZ. 2021-08-27T13:48:18.39 1.0 undecidable manual S 240 109.113 50 0.02 21
GU.EQUI.HHZ. 2021-08-27T13:48:15.73 1.0 undecidable manual S 114 100.8213 50 -0.41 20
IV.SALO.HHZ. 2021-08-27T13:48:15.67 0.6 undecidable manual P 44 169.3971 50 1.51 19
GU.GBOS.HHZ. 2021-08-27T13:48:14.83 1.0 undecidable manual S 251 97.3248 50 -0.38 20
IV.PLMA.HHZ. 2021-08-27T13:48:12.15 0.6 undecidable manual S 128 87.1461 50 -0.36 41
GU.RSP.HHZ. 2021-08-27T13:48:11.21 0.3 undecidable manual P 297 151.8369 50 -0.25 54
GU.TRAV.HHZ. 2021-08-27T13:48:10.90 1.0 undecidable manual P 318 145.6431 50 0.39 18
GU.STV.HHZ. 2021-08-27T13:48:09.26 0.1 undecidable manual P 257 136.1637 50 0.21 76
GU.MAIM.HHZ. 2021-08-27T13:48:09.88 1.0 undecidable manual P 120 137.7621 50 0.58 17
GU.BHB.HHZ. 2021-08-27T13:48:09.71 0.3 undecidable manual P 284 140.4483 50 0.01 59
GU.CARD.HHZ. 2021-08-27T13:48:08.87 1.0 undecidable manual P 115 131.1687 50 0.6 17
IV.MONC.HHN. 2021-08-27T13:48:05.13 0.6 undecidable manual P 306 102.8193 50 1.22 28
GU.IMI.HHZ. 2021-08-27T13:48:05.72 0.6 undecidable manual P 232 111.8991 50 0.41 38
GU.MGRO.HHZ. 2021-08-27T13:48:04.84 0.6 undecidable manual P 240 109.113 50 -0.04 42
GU.EQUI.HHZ. 2021-08-27T13:48:03.89 1.0 undecidable manual P 114 100.8213 50 0.3 20
GU.GBOS.HHZ. 2021-08-27T13:48:02.81 0.1 undecidable manual P 251 97.3248 50 -0.25 82
IV.PLMA.HHZ. 2021-08-27T13:48:02.03 0.3 undecidable manual P 128 87.1461 50 0.54 58
GU.RORO.HHZ. 2021-08-27T13:48:01.25 0.1 undecidable manual P 238 87.5457 50 -0.3 82
IV.BOB.HNE. 2021-08-27T13:48:01.10 0.6 undecidable manual S 55 43.8228 50 0.17 46
GU.GRAM.HHZ. 2021-08-27T13:48:01.47 0.6 undecidable manual P 93 84.8484 50 0.33 41
GU.PCP.HHZ. 2021-08-27T13:47:58.00 0.6 undecidable manual S 270 35.5422 50 -0.71 40
GU.CANO.HHZ. 2021-08-27T13:47:58.49 0.3 undecidable manual P 239 70.4739 50 -0.43 62
IV.QLNO.HHZ. 2021-08-27T13:47:56.31 0.3 undecidable manual P 245 56.6988 50 -0.48 63
IV.MSSA.HHZ. 2021-08-27T13:47:55.50 0.3 undecidable manual P 121 48.2184 50 0 71
GU.GORR.HHZ. 2021-08-27T13:47:54.90 0.3 undecidable manual S 72 24.753 111 -0.76 60
IV.BOB.HNE. 2021-08-27T13:47:54.78 0.1 undecidable manual P 55 43.8228 50 -0.03 94
GU.GENL.EHZ. 2021-08-27T13:47:53.20 0.3 undecidable manual S 188 14.9739 123 0.57 66
IV.SARZ.HHZ. 2021-08-27T13:47:53.69 0.6 undecidable manual P 350 36.9297 50 -0.06 48
GU.PCP.HHZ. 2021-08-27T13:47:52.67 0.1 negative manual P 270 35.5422 50 -0.86 75
IT.GNV.HGZ. 2021-08-27T13:47:52.50 0.3 undecidable manual S 203 12.9759 127 0.45 68
GU.GORR.HHZ. 2021-08-27T13:47:51.11 0.1 undecidable manual P 72 24.753 111 -0.66 83
GU.RNCA.HHZ. 2021-08-27T13:47:50.70 0.3 undecidable manual S 204 8.2806 139 -0.17 73
GU.GENL.EHZ. 2021-08-27T13:47:50.16 0.1 positive manual P 188 14.9739 123 0.14 97
IT.GNV.HGZ. 2021-08-27T13:47:49.76 0.1 positive manual P 203 12.9759 127 0.08 99
GU.RNCA.HHZ. 2021-08-27T13:47:48.95 0.1 positive manual P 204 8.2806 139 -0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.GENL.EHN. ML:2.7 0.004495 0.92 AML other m 2021-08-27T13:47:54.51
GU.GENL.EHE. ML:2.4 0.0025800000000000003 0.14 AML other m 2021-08-27T13:47:54.00
GU.GORR.HHN. ML:2.9 0.0044599999999999996 1.46 AML other m 2021-08-27T13:47:54.24
GU.GORR.HHE. ML:2.9 0.0046749999999999995 1.38 AML other m 2021-08-27T13:47:56.99
GU.PCP.HHE. ML:2.2 0.0006779999999999999 1.18 AML other m 2021-08-27T13:47:58.23
GU.PCP.HHN. ML:2.2 0.0006910000000000001 0.26 AML other m 2021-08-27T13:47:59.44
IV.SARZ.HHN. ML:2.9 0.0028200000000000005 0.62 AML other m 2021-08-27T13:48:02.51
IV.SARZ.HNN. ML:2.8 0.002675 0.62 AML other m 2021-08-27T13:48:02.51
IV.SARZ.HHE. ML:3.0 0.0035600000000000002 1.46 AML other m 2021-08-27T13:48:03.97
IV.SARZ.HNE. ML:3.0 0.00349 1.46 AML other m 2021-08-27T13:48:03.98
IV.QLNO.HHN. ML:2.3 0.00048750000000000003 0.46 AML other m 2021-08-27T13:48:07.38
IV.QLNO.HHE. ML:2.3 0.0004265 0.5 AML other m 2021-08-27T13:48:08.27
GU.CANO.HHN. ML:2.7 0.0009155 1.16 AML other m 2021-08-27T13:48:10.33
GU.CANO.HHE. ML:2.6 0.0006850000000000001 1.36 AML other m 2021-08-27T13:48:12.11
GU.RORO.HHN. ML:2.5 0.000406 1.1 AML other m 2021-08-27T13:48:14.67
GU.RORO.HHE. ML:2.6 0.0005045 0.76 AML other m 2021-08-27T13:48:15.76
IV.PLMA.HHE. ML:2.5 0.00035350000000000003 0.8 AML other m 2021-08-27T13:48:16.23
IV.PLMA.HHN. ML:2.5 0.000383 0.54 AML other m 2021-08-27T13:48:17.48
GU.GRAM.HHE. ML:2.6 0.0004435 0.3 AML other m 2021-08-27T13:48:18.20
GU.GBOS.HHN. ML:2.4 0.0002775 0.4 AML other m 2021-08-27T13:48:18.03
GU.EQUI.HHE. ML:2.3 0.000184 0.26 AML other m 2021-08-27T13:48:18.84
GU.EQUI.HHN. ML:2.4 0.0002705 0.34 AML other m 2021-08-27T13:48:19.18
GU.GBOS.HHE. ML:2.1 0.000142 0.66 AML other m 2021-08-27T13:48:19.16
GU.IMI.HHE. ML:2.5 0.0002665 1.68 AML other m 2021-08-27T13:48:21.96
GU.GRAM.HHN. ML:2.4 0.000324 0.7 AML other m 2021-08-27T13:48:21.49
GU.MGRO.HHE. ML:2.4 0.00021799999999999999 1.02 AML other m 2021-08-27T13:48:21.52
GU.MGRO.HHN. ML:2.5 0.00025550000000000003 0.7 AML other m 2021-08-27T13:48:21.83
GU.IMI.HHN. ML:2.6 0.000352 0.96 AML other m 2021-08-27T13:48:23.00
GU.CARD.HHE. ML:2.8 0.00035999999999999997 1.08 AML other m 2021-08-27T13:48:27.08
GU.STV.HHN. ML:2.1 0.000078 1.24 AML other m 2021-08-27T13:48:27.37
GU.CARD.HHN. ML:2.6 0.000268 0.4 AML other m 2021-08-27T13:48:28.67
GU.MAIM.HHE. ML:2.3 0.0001175 0.34 AML other m 2021-08-27T13:48:29.07
GU.MAIM.HHN. ML:2.4 0.000152 0.26 AML other m 2021-08-27T13:48:29.35
GU.STV.HHE. ML:2.1 0.00008155 0.58 AML other m 2021-08-27T13:48:30.38
GU.BHB.HHN. ML:2.2 0.00009635000000000001 1.32 AML other m 2021-08-27T13:48:30.21
GU.TRAV.HHE. ML:2.8 0.00038 1.04 AML other m 2021-08-27T13:48:31.77
GU.TRAV.HHN. ML:2.7 0.00028349999999999995 0.24 AML other m 2021-08-27T13:48:31.25
GU.BHB.HNN. ML:2.3 0.00010850000000000001 0.8 AML other m 2021-08-27T13:48:31.21
GU.BHB.HHE. ML:2.2 0.0000989 0.5 AML other m 2021-08-27T13:48:32.67
GU.BHB.HNE. ML:2.3 0.00011300000000000001 1.08 AML other m 2021-08-27T13:48:32.14
GU.RSP.HHE. ML:2.2 0.00007835000000000001 0.72 AML other m 2021-08-27T13:48:38.41
IV.SALO.HHN. ML:2.6 0.0001485 0.84 AML other m 2021-08-27T13:48:39.61
CH.MMK.HHN. ML:1.9 0.0000226 0.34 AML other m 2021-08-27T13:48:40.38
GU.RSP.HHN. ML:2.2 0.00006975 0.32 AML other m 2021-08-27T13:48:40.58
CH.MMK.HHE. ML:1.9 0.000024500000000000003 0.3 AML other m 2021-08-27T13:48:41.32
IV.SALO.HHE. ML:2.4 0.0000972 0.74 AML other m 2021-08-27T13:48:42.79
IV.MAGA.HHN. ML:2.7 0.0001605 0.28 AML other m 2021-08-27T13:48:46.48
IV.MAGA.HHE. ML:3.0 0.0003135 0.54 AML other m 2021-08-27T13:48:48.54
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