Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 06-08-2021 and time 07:12:51 (Italy) in region 6 km W Forlì (FC)

A magnitude ML 1.5 earthquake occured in region: 6 km W Forlì (FC), on

  • 06-08-2021 05:12:51 (UTC)
  • 06-08-2021 07:12:51 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.2340, 11.9730 at 28 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
Forlì FC 6 117913 117913
Castrocaro Terme e Terra del Sole FC 7 6426 124339
Faenza RA 9 58541 182880
Forlimpopoli FC 13 13290 196170
Meldola FC 14 9970 206140
Dovadola FC 14 1653 207793
Predappio FC 15 6346 214139
Bertinoro FC 16 11059 225198
Russi RA 16 12247 237445
Brisighella RA 16 7639 245084
Modigliana FC 17 4560 249644
Castel Bolognese RA 17 9554 259198
Cotignola RA 17 7474 266672
Solarolo RA 18 4488 271160

Municipalities with at least 50000 inhabitants

An earthquake occurred to
6 Km W of Forlì (117913 inhabitants)
9 Km SE of Faenza (58541 inhabitants)
24 Km W of Cesena (96758 inhabitants)
25 Km SE of Imola (69797 inhabitants)
27 Km SW of Ravenna (159116 inhabitants)
51 Km W of Rimini (147750 inhabitants)
58 Km SE of Bologna (386663 inhabitants)
73 Km SE of Ferrara (133155 inhabitants)
77 Km NE of Firenze (382808 inhabitants)
80 Km E of Prato (191150 inhabitants)
82 Km NE of Scandicci (50609 inhabitants)
83 Km W of Pesaro (94582 inhabitants)
86 Km N of Arezzo (99543 inhabitants)
91 Km E of Pistoia (90315 inhabitants)
94 Km S of Rovigo (51867 inhabitants)
94 Km W of Fano (60888 inhabitants)
95 Km E of Modena (184973 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 2021-08-06
05:12:51		 44.2338 11.9733 28 2021-12-29
11:12:31		 Bollettino Sismico Italiano INGV 95596461
Reviewed
Rev100 		ML 1.4 2021-08-06
05:12:52		 44.1592 11.9765 10 2021-08-06
05:20:42		 Sala Sismica INGV-Roma 93736321
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-06 05:12:51 ± 0.37
Latitude 44.2338 ± 0.0180
Longitude 11.9733 ± 0.0188
Depth (km) 28 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 95596461

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1651
Semi-minor axis of confidence ellipse (meter) 1476
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 136
Circular confidence region, given by single value of horizontal uncertainty (meter) 1650.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 151
Number of associated phases, regardless of their use for origin computation 25
Number of defining phases 16
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) 0.51711
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 95596461
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-09-18 17:42:34

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 93736321
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-06 05:20:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.GIZZ.HHZ. 2021-08-06T05:14:39.96 3.0 undecidable manual Pg 16.15 0
IV.CELI.HHZ. 2021-08-06T05:14:24.18 3.0 undecidable manual Pn 3.54 0
IV.VIVA.HHZ. 2021-08-06T05:14:10.43 3.0 undecidable manual Sg 3.92 0
IX.SCL3.EHZ.02 2021-08-06T05:14:09.62 3.0 undecidable manual Pg 9.54 0
IV.DGI.HHZ. 2021-08-06T05:13:55.18 3.0 undecidable manual Pn -2.91 0
IV.VOBA.EHZ. 2021-08-06T05:13:52.08 3.0 undecidable manual Sg 0.81 0
IV.MNTT.EHZ. 2021-08-06T05:13:44.95 3.0 undecidable manual Sn -0.84 0
IV.GAVE.EHZ. 2021-08-06T05:13:21.51 3.0 positive manual Pn -1.01 0
IV.ARVD.HHZ. 2021-08-06T05:13:12.05 3.0 negative manual P -0.94 0
IV.RUFI.EHE. 2021-08-06T05:13:09.89 0.6 undecidable manual S 220 57.3981 110 0.29 47
IV.ASQU.HHZ. 2021-08-06T05:13:08.32 0.6 undecidable manual S 197 50.7159 112 0.4 46
IV.SEI.HHZ. 2021-08-06T05:13:08.88 0.6 undecidable manual S 248 52.8027 111 0.42 47
IV.VISG.HHZ. 2021-08-06T05:13:06.92 0.3 undecidable manual S 264 43.1235 117 0.83 62
IV.SFI.EHZ. 2021-08-06T05:13:04.76 0.6 undecidable manual S 195 37.8288 120 -0.09 52
IV.LMD.HHZ. 2021-08-06T05:13:01.87 0.3 undecidable manual S 231 27.3504 130 -0.69 73
IV.RUFI.EHE. 2021-08-06T05:13:01.75 0.3 undecidable manual P 220 57.3981 110 -0.01 75
IV.SEI.HHZ. 2021-08-06T05:13:01.17 0.6 undecidable manual P 248 52.8027 111 0.07 51
IV.BRSN.EHE. 2021-08-06T05:13:00.44 0.3 undecidable manual S 57 10.1787 158 0.65 67
IV.BRIS.HHZ. 2021-08-06T05:13:00.04 0.3 undecidable manual S 266 16.4724 146 -0.56 76
IV.ASQU.HHZ. 2021-08-06T05:13:00.78 0.3 undecidable manual P 197 50.7159 112 -0.01 77
IV.VISG.HHZ. 2021-08-06T05:12:59.82 0.3 undecidable manual P 264 43.1235 117 0.08 78
IV.SFI.EHZ. 2021-08-06T05:12:58.88 0.3 undecidable manual P 195 37.8288 120 -0.14 77
IV.LMD.HHZ. 2021-08-06T05:12:57.23 0.3 undecidable manual P 231 27.3504 130 -0.47 73
IV.BRIS.HHZ. 2021-08-06T05:12:56.15 0.1 undecidable manual P 266 16.4724 146 -0.41 100
IV.BRSN.EHE. 2021-08-06T05:12:55.97 0.3 undecidable manual P 57 10.1787 158 -0.13 80
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BRIS.HHE. ML:2.0 0.00042449999999999996 0.3 AML other m 2021-08-06T05:13:00.14
IV.BRIS.HHN. ML:1.8 0.0002785 0.38 AML other m 2021-08-06T05:13:00.27
IV.LMD.HHE. ML:1.6 0.000143 0.3 AML other m 2021-08-06T05:13:02.32
IV.LMD.HHN. ML:1.7 0.000184 0.16 AML other m 2021-08-06T05:13:03.32
IV.SFI.EHN. ML:1.4 0.0000642 1 AML other m 2021-08-06T05:13:05.37
IV.SFI.EHE. ML:1.5 0.0000857 0.98 AML other m 2021-08-06T05:13:05.70
IV.ASQU.HHN. ML:1.2 0.00003545 0.5 AML other m 2021-08-06T05:13:09.35
IV.ASQU.HHE. ML:1.3 0.00003795 0.6 AML other m 2021-08-06T05:13:09.34
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