Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 18-09-2021 and time 23:12:57 (UTC) in region 4 km SE Dozza (BO)

A magnitude ML 1.0 earthquake occured in region: 4 km SE Dozza (BO), on

  • 18-09-2021 23:12:57 (UTC)
  • 19-09-2021 01:12:57 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.3300, 11.6610 at 33 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Dozza BO 4 6652 6652
Casalfiumanese BO 5 3438 10090
Imola BO 5 69797 79887
Riolo Terme RA 8 5720 85607
Borgo Tossignano BO 8 3288 88895
Castel San Pietro Terme BO 10 20811 109706
Castel Bolognese RA 11 9554 119260
Fontanelice BO 11 1943 121203
Castel Guelfo di Bologna BO 12 4455 125658
Casola Valsenio RA 12 2617 128275
Mordano BO 14 4760 133035
Bagnara di Romagna RA 15 2429 135464
Brisighella RA 15 7639 143103
Solarolo RA 15 4488 147591
Medicina BO 17 16739 164330
Castel del Rio BO 18 1246 165576
Faenza RA 18 58541 224117
Massa Lombarda RA 19 10653 234770
Ozzano dell'Emilia BO 19 13596 248366

Municipalities with at least 50000 inhabitants

An earthquake occurred to
5 Km SW of Imola (69797 inhabitants)
18 Km W of Faenza (58541 inhabitants)
31 Km SE of Bologna (386663 inhabitants)
33 Km W of Forlì (117913 inhabitants)
44 Km W of Ravenna (159116 inhabitants)
51 Km W of Cesena (96758 inhabitants)
57 Km S of Ferrara (133155 inhabitants)
67 Km NE of Prato (191150 inhabitants)
68 Km SE of Modena (184973 inhabitants)
70 Km NE of Firenze (382808 inhabitants)
74 Km NE of Pistoia (90315 inhabitants)
74 Km NE of Scandicci (50609 inhabitants)
78 Km W of Rimini (147750 inhabitants)
80 Km SE of Carpi (70699 inhabitants)
83 Km S of Rovigo (51867 inhabitants)
91 Km E of Reggio nell'Emilia (171345 inhabitants)
98 Km N of Arezzo (99543 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
Reviewed
Rev100 		ML 1.0 2021-09-18
23:12:57		 44.33 11.6613 33 2021-09-18
23:22:48		 Sala Sismica INGV-Roma 95605171
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-18 23:12:57 ± 0.44
Latitude 44.3300 ± 0.0180
Longitude 11.6613 ± 0.0214
Depth (km) 33 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95605171

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1961
Semi-minor axis of confidence ellipse (meter) 688
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 148
Circular confidence region, given by single value of horizontal uncertainty (meter) 1960.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 84
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.36
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.33275
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 95605171
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-18 23:22:48
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SEI.HHZ. 2021-09-18T23:13:11.98 3.0 undecidable manual S 0
IV.MTRZ.HNN. 2021-09-18T23:13:08.70 0.3 undecidable manual S 264 18.87 147 0.45 68
IV.VISG.HHZ. 2021-09-18T23:13:08.58 0.3 undecidable manual S 229 23.8539 141 -0.46 68
IV.SEI.HHZ. 2021-09-18T23:13:06.88 3.0 negative manual P 0.57 0
IV.IMOL.EHZ. 2021-09-18T23:13:06.90 0.1 undecidable manual S 63 7.1928 166 -0.12 100
IV.FIU.EHZ. 2021-09-18T23:13:05.04 0.3 undecidable manual P 339 36.9297 127 -0.45 67
IV.LMD.HHZ. 2021-09-18T23:13:04.55 0.1 undecidable manual P 173 28.2495 135 0.06 98
IV.BRIS.HHZ. 2021-09-18T23:13:03.46 0.1 negative manual P 144 14.3745 154 0.22 97
IV.MTRZ.HNN. 2021-09-18T23:13:03.95 0.3 undecidable manual P 264 18.87 147 0.38 69
IV.VISG.HHZ. 2021-09-18T23:13:03.72 0.3 undecidable manual P 229 23.8539 141 -0.31 70
IV.IMOL.EHZ. 2021-09-18T23:13:02.99 0.1 undecidable manual P 63 7.1928 166 0.13 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VISG.HHN. ML:0.8 0.000025099999999999997 0.16 AML other m 2021-09-18T23:13:09.24
IV.VISG.HHE. ML:0.6 0.0000172 0.4 AML other m 2021-09-18T23:13:09.25
IV.BRIS.HHN. ML:1.1 0.000056349999999999994 0.24 AML other m 2021-09-18T23:13:09.86
IV.SEI.HHE. ML:1.1 0.0000277 0.32 AML other m 2021-09-18T23:13:12.49
IV.SEI.HHN. ML:1.2 0.00004615 0.2 AML other m 2021-09-18T23:13:13.65
IV.BRIS.HHE. ML:1.2 0.00006225 1.22 AML other m 2021-09-18T23:13:16.64
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