Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 30-09-2021 and time 10:40:37 (Italy) in region 2 km N Grizzana Morandi (BO)

A magnitude ML 1.5 earthquake occured in region: 2 km N Grizzana Morandi (BO), on

  • 30-09-2021 08:40:37 (UTC)
  • 30-09-2021 10:40:37 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.2710, 11.1520 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
Grizzana Morandi BO 2 3916 3916
Vergato BO 3 7639 11555
Marzabotto BO 9 6779 18334
San Benedetto Val di Sambro BO 9 4315 22649
Monzuno BO 10 6328 28977
Castel d'Aiano BO 12 1906 30883
Camugnano BO 12 1885 32768
Loiano BO 14 4294 37062
Castiglione dei Pepoli BO 14 5648 42710
Monghidoro BO 14 3749 46459
Zocca MO 15 4719 51178
Castel di Casio BO 15 3448 54626
Sasso Marconi BO 16 14735 69361
Montese MO 17 3353 72714
Gaggio Montano BO 19 4878 77592
Alto Reno Terme BO 19 6960 84552
Pianoro BO 20 17460 102012

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km SW of Bologna (386663 inhabitants)
42 Km NE of Pistoia (90315 inhabitants)
44 Km N of Prato (191150 inhabitants)
45 Km SE of Modena (184973 inhabitants)
46 Km W of Imola (69797 inhabitants)
56 Km N of Firenze (382808 inhabitants)
57 Km N of Scandicci (50609 inhabitants)
58 Km W of Faenza (58541 inhabitants)
61 Km SE of Carpi (70699 inhabitants)
63 Km SE of Reggio nell'Emilia (171345 inhabitants)
70 Km NE of Lucca (89046 inhabitants)
71 Km W of Forlì (117913 inhabitants)
73 Km SW of Ferrara (133155 inhabitants)
85 Km E of Massa (69479 inhabitants)
85 Km NE of Viareggio (62467 inhabitants)
85 Km W of Ravenna (159116 inhabitants)
86 Km NE of Pisa (89158 inhabitants)
87 Km E of Carrara (63133 inhabitants)
88 Km SE of Parma (192836 inhabitants)
88 Km W of Cesena (96758 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 1.5 2021-09-30
08:40:37		 44.2712 11.152 9 2022-03-30
13:04:10		 Bollettino Sismico Italiano INGV 96436301
Reviewed
Rev100 		ML 1.7 2021-09-30
08:40:37		 44.2798 11.1758 11 2021-09-30
08:51:30		 Sala Sismica INGV-Roma 96055911
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-30 08:40:37 ± 0.14
Latitude 44.2712 ± 0.0072
Longitude 11.1520 ± 0.0063
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 96436301

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 752
Semi-minor axis of confidence ellipse (meter) 382
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 171
Circular confidence region, given by single value of horizontal uncertainty (meter) 750.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 136
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.10522
Epicentral distance of station farthest from the epicenter (degree) 0.54499
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 96436301
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-07 16:39:23

ML:1.7

Field Value
Value 1.7
Uncertainty 0.1
Num. used stations 8
Type of magnitude ML
Reference to an origin 96055911
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-30 08:51:30
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.SARM.EHN. 2021-09-30T08:40:57.27 0.6 undecidable manual S 261 60.495 50 0.22 46
IV.BRIS.HHN. 2021-09-30T08:40:54.28 0.3 undecidable manual S 96 49.1175 50 0.26 69
IV.LMD.HHE. 2021-09-30T08:40:54.18 0.6 undecidable manual S 116 49.1175 50 0.16 47
IV.BDI.HNZ. 2021-09-30T08:40:53.97 0.3 undecidable manual S 243 49.9167 50 -0.27 69
GU.POPM.HHZ. 2021-09-30T08:40:51.75 0.3 undecidable manual S 232 40.2264 50 0.1 73
IV.MPPT.EHN. 2021-09-30T08:40:50.38 0.6 undecidable manual S 188 35.1426 50 0.09 49
GU.SARM.EHN. 2021-09-30T08:40:48.73 0.6 undecidable manual P 261 60.495 50 -0.23 45
IV.SEI.HHZ. 2021-09-30T08:40:48.53 0.3 undecidable manual S 146 29.1486 107 0.06 75
IV.MOCL.EHZ. 2021-09-30T08:40:48.85 0.3 undecidable manual S 176 29.6481 106 0.22 72
IV.BRIS.HHN. 2021-09-30T08:40:47.13 0.1 undecidable manual P 96 49.1175 50 -0.08 96
IV.LMD.HHE. 2021-09-30T08:40:47.54 0.6 undecidable manual P 116 49.1175 50 0.32 46
IV.BDI.HNZ. 2021-09-30T08:40:47.60 0.6 undecidable manual P 243 49.9167 50 0.26 46
IV.VISG.HHZ. 2021-09-30T08:40:46.39 0.3 undecidable manual S 112 24.2535 110 -0.46 69
GU.POPM.HHZ. 2021-09-30T08:40:45.68 0.6 undecidable manual P 232 40.2264 50 -0.16 48
IV.MPPT.EHN. 2021-09-30T08:40:44.80 0.1 undecidable manual P 188 35.1426 50 -0.26 95
IV.MTRZ.HNN. 2021-09-30T08:40:43.90 0.6 undecidable manual P 78 22.1556 111 1.22 34
IV.SEI.HHZ. 2021-09-30T08:40:43.57 0.1 undecidable manual P 146 29.1486 107 -0.44 92
IV.FNVD.HHZ. 2021-09-30T08:40:43.28 0.3 undecidable manual S 191 11.6772 127 0.31 73
IV.MOCL.EHZ. 2021-09-30T08:40:43.93 0.3 undecidable manual P 176 29.6481 106 -0.17 73
IV.VISG.HHZ. 2021-09-30T08:40:42.74 0.6 undecidable manual P 112 24.2535 110 -0.33 48
IV.FNVD.HHZ. 2021-09-30T08:40:41.03 0.1 positive manual P 191 11.6772 127 0.19 100
IV.ZCCA.HNN. 2021-09-30T08:40:41.50 0.6 undecidable manual P 302 16.4724 118 -0.15 50
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FNVD.HHE. ML:1.5 0.00043100000000000007 1.92 AML other m 2021-09-30T08:40:44.03
IV.FNVD.HHN. ML:1.5 0.0004305 1.78 AML other m 2021-09-30T08:40:44.08
IV.VISG.HHN. ML:0.9 0.0000493 0.8 AML other m 2021-09-30T08:40:46.85
IV.VISG.HHE. ML:0.8 0.00003635 1.66 AML other m 2021-09-30T08:40:47.16
IV.SEI.HHE. ML:1.6 0.0002205 0.46 AML other m 2021-09-30T08:40:48.95
IV.SEI.HHN. ML:1.8 0.00035 1.68 AML other m 2021-09-30T08:40:49.05
IV.MOCL.EHN. ML:1.5 0.00016749999999999998 0.24 AML other m 2021-09-30T08:40:50.17
IV.MOCL.EHE. ML:1.4 0.00011615 0.32 AML other m 2021-09-30T08:40:50.27
GU.POPM.HHE. ML:1.7 0.0001725 0.34 AML other m 2021-09-30T08:40:52.22
GU.POPM.HHN. ML:1.7 0.00017449999999999999 0.18 AML other m 2021-09-30T08:40:52.48
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