Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 27-09-2021 and time 00:33:31 (UTC) in region 3 km W Davagna (GE)

A magnitude ML 1.9 earthquake occured in region: 3 km W Davagna (GE), on

  • 27-09-2021 00:33:31 (UTC)
  • 27-09-2021 02:33:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.4700, 9.0520 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
Davagna GE 3 1884 1884
Bargagli GE 4 2708 4592
Montoggio GE 5 2067 6659
Sant'Olcese GE 7 5906 12565
Lumarzo GE 7 1535 14100
Casella GE 8 3144 17244
Valbrevenna GE 10 798 18042
Torriglia GE 10 2311 20353
Serra Riccò GE 10 7885 28238
Bogliasco GE 10 4488 32726
Uscio GE 11 2284 35010
Pieve Ligure GE 11 2544 37554
Neirone GE 11 916 38470
Genova GE 11 586655 625125
Sori GE 12 4205 629330
Savignone GE 12 3205 632535
Mignanego GE 13 3675 636210
Avegno GE 13 2525 638735
Tribogna GE 13 614 639349
Ceranesi GE 13 3875 643224
Crocefieschi GE 13 548 643772
Campomorone GE 13 6996 650768
Moconesi GE 14 2614 653382
Recco GE 14 9752 663134
Busalla GE 14 5563 668697
Vobbia GE 15 409 669106
Propata GE 15 142 669248
Camogli GE 16 5378 674626
Cicagna GE 16 2502 677128
Favale di Malvaro GE 17 466 677594
Rondanina GE 17 62 677656
Montebruno GE 17 240 677896
Ronco Scrivia GE 17 4417 682313
Fascia GE 18 81 682394
Lorsica GE 18 468 682862
Mongiardino Ligure AL 19 165 683027
Orero GE 19 565 683592
Coreglia Ligure GE 19 285 683877
Carrega Ligure AL 19 84 683961
Fraconalto AL 19 336 684297
Rapallo GE 20 29796 714093
Santa Margherita Ligure GE 20 9338 723431

Municipalities with at least 50000 inhabitants

An earthquake occurred to
11 Km NE of Genova (586655 inhabitants)
49 Km E of Savona (61345 inhabitants)
60 Km SE of Alessandria (93943 inhabitants)
74 Km NW of La Spezia (93959 inhabitants)
80 Km S of Pavia (72576 inhabitants)
82 Km SW of Piacenza (102191 inhabitants)
82 Km SE of Asti (76202 inhabitants)
94 Km W of Carrara (63133 inhabitants)
96 Km S of Vigevano (63310 inhabitants)
99 Km W of Massa (69479 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 1.9 2021-09-27
00:33:31		 44.4705 9.0525 10 2022-03-30
13:04:10		 Bollettino Sismico Italiano INGV 96322761
Reviewed
Rev100 		ML 1.9 2021-09-27
00:33:31		 44.473 9.0557 9 2021-09-27
00:42:30		 Sala Sismica INGV-Roma 95923721
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-27 00:33:31 ± 0.07
Latitude 44.4705 ± 0.0054
Longitude 9.0525 ± 0.0050
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 96322761

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 602
Semi-minor axis of confidence ellipse (meter) 335
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 182
Circular confidence region, given by single value of horizontal uncertainty (meter) 600.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 96
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 30
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.07195
Epicentral distance of station farthest from the epicenter (degree) 1.19250
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 15
Magnitudes information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 15
Type of magnitude ML
Reference to an origin 96322761
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-07 14:56:12

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 95923721
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-27 00:42:30
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.ENR.HHZ. 2021-09-27T00:34:10.04 0.6 undecidable manual S 259 132.3675 50 0.09 39
GU.GBOS.HHZ. 2021-09-27T00:34:01.13 0.6 undecidable manual S 256 99.4227 50 -0.04 43
GU.RORO.HHZ. 2021-09-27T00:33:58.39 0.6 undecidable manual S 243 87.7455 50 0.35 41
IV.PLMA.HHZ. 2021-09-27T00:33:55.22 0.6 undecidable manual S 126 78.9654 50 -0.46 41
GU.GRAM.HHZ. 2021-09-27T00:33:55.83 0.6 undecidable manual S 88 80.1642 50 -0.18 43
GU.CANO.HHZ. 2021-09-27T00:33:54.16 0.6 undecidable manual S 246 70.9734 50 0.6 39
GU.ROTM.HHZ. 2021-09-27T00:33:53.31 0.6 undecidable manual S 307 69.375 50 0.17 44
GU.ENR.HHZ. 2021-09-27T00:33:53.85 0.6 undecidable manual P 259 132.3675 50 0.02 40
IV.QLNO.HHZ. 2021-09-27T00:33:50.18 0.6 undecidable manual S 254 58.2972 50 0 46
GU.GBOS.HHZ. 2021-09-27T00:33:48.87 0.3 undecidable manual P 256 99.4227 50 0.11 63
IV.SARZ.HHE. 2021-09-27T00:33:47.01 0.6 undecidable manual S 346 45.3213 50 0.29 45
IV.BOB.HHE. 2021-09-27T00:33:46.75 0.6 undecidable manual S 43 45.4212 50 0.01 47
GU.RORO.HHZ. 2021-09-27T00:33:46.87 0.6 undecidable manual P 243 87.7455 50 -0.09 43
GU.GRAM.HHZ. 2021-09-27T00:33:46.19 0.3 undecidable manual P 88 80.1642 50 0.4 61
IV.PLMA.HHZ. 2021-09-27T00:33:46.24 0.3 undecidable manual P 126 78.9654 50 0.64 57
IV.MSSA.HHZ. 2021-09-27T00:33:45.14 0.3 undecidable manual S 115 40.626 50 -0.32 67
GU.PCP.HHZ. 2021-09-27T00:33:45.37 0.3 undecidable manual S 281 40.8258 50 -0.15 70
GU.ROTM.HHZ. 2021-09-27T00:33:44.48 0.3 undecidable manual P 307 69.375 50 0.35 63
GU.CANO.HHZ. 2021-09-27T00:33:44.15 0.3 undecidable manual P 246 70.9734 50 -0.22 65
IV.QLNO.HHZ. 2021-09-27T00:33:42.05 0.1 undecidable manual P 254 58.2972 50 -0.37 86
IV.BOB.HHE. 2021-09-27T00:33:40.46 0.1 undecidable manual P 43 45.4212 50 0.03 95
IV.SARZ.HHE. 2021-09-27T00:33:40.47 0.3 undecidable manual P 346 45.3213 50 0.05 71
IV.MSSA.HHZ. 2021-09-27T00:33:39.60 0.1 undecidable manual P 115 40.626 50 -0.09 94
GU.PCP.HHZ. 2021-09-27T00:33:39.10 0.1 negative manual P 281 40.8258 50 -0.63 82
IT.GNV.HGZ. 2021-09-27T00:33:36.65 0.3 undecidable manual S 246 10.4784 132 -0.08 75
GU.GENL.EHZ. 2021-09-27T00:33:36.80 0.3 undecidable manual S 222 9.7791 134 0.25 72
GU.RNCA.HHZ. 2021-09-27T00:33:35.71 0.3 undecidable manual S 270 7.9809 140 -0.43 70
GU.GENL.EHZ. 2021-09-27T00:33:34.79 0.1 positive manual P 222 9.7791 134 0.24 96
GU.RNCA.HHZ. 2021-09-27T00:33:34.24 0.1 negative manual P 270 7.9809 140 -0.08 100
IT.GNV.HGZ. 2021-09-27T00:33:34.79 0.1 undecidable manual P 246 10.4784 132 0.13 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.RNCA.HHE. ML:2.2 0.002334257 0.12 AML other m 2021-09-27T00:33:35.83
GU.RNCA.HHN. ML:2.2 0.00254 0.16 AML other m 2021-09-27T00:33:35.83
GU.GENL.EHN. ML:2.1 0.0017211540000000001 0.14 AML other m 2021-09-27T00:33:36.92
GU.GENL.EHE. ML:2.0 0.001421797 0.16 AML other m 2021-09-27T00:33:37.43
IV.QLNO.HHN. ML:1.3 0.00004005835 0.18 AML other m 2021-09-27T00:33:51.81
IV.QLNO.HHE. ML:1.3 0.000042235595 0.18 AML other m 2021-09-27T00:33:52.84
GU.CANO.HHN. ML:2.0 0.00018449999999999999 0.44 AML other m 2021-09-27T00:33:54.82
GU.CANO.HHE. ML:2.0 0.0001535 0.36 AML other m 2021-09-27T00:33:56.30
IV.PLMA.HHN. ML:1.9 0.00011899999999999999 1.1 AML other m 2021-09-27T00:33:57.70
IV.PLMA.HHE. ML:1.8 0.00008084381 1.7 AML other m 2021-09-27T00:33:58.01
GU.RORO.HHN. ML:1.6 0.00004676673 0.2 AML other m 2021-09-27T00:33:59.85
GU.ROTM.HHE. ML:2.0 0.0001475263 0.56 AML other m 2021-09-27T00:34:00.31
GU.ROTM.HHN. ML:2.0 0.00018838239499999998 1.48 AML other m 2021-09-27T00:34:02.05
GU.GBOS.HHE. ML:1.5 0.000028700000000000003 0.46 AML other m 2021-09-27T00:34:03.76
GU.GBOS.HHN. ML:1.6 0.00003885 0.38 AML other m 2021-09-27T00:34:03.83
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