Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 07-08-2021 and time 18:14:38 (Italy) in region 3 km W Forlì (FC)

A magnitude ML 1.3 earthquake occured in region: 3 km W Forlì (FC), on

  • 07-08-2021 16:14:38 (UTC)
  • 07-08-2021 18:14:38 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.2160, 12.0020 at 21 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 3 117913 117913
Castrocaro Terme e Terra del Sole FC 6 6426 124339
Forlimpopoli FC 11 13290 137629
Meldola FC 11 9970 147599
Faenza RA 12 58541 206140
Predappio FC 13 6346 212486
Bertinoro FC 13 11059 223545
Dovadola FC 14 1653 225198
Russi RA 18 12247 237445
Modigliana FC 18 4560 242005
Brisighella RA 19 7639 249644
Cotignola RA 19 7474 257118
Castel Bolognese RA 20 9554 266672

Municipalities with at least 50000 inhabitants

An earthquake occurred to
3 Km W of Forlì (117913 inhabitants)
12 Km SE of Faenza (58541 inhabitants)
21 Km W of Cesena (96758 inhabitants)
27 Km SW of Ravenna (159116 inhabitants)
28 Km SE of Imola (69797 inhabitants)
48 Km W of Rimini (147750 inhabitants)
61 Km SE of Bologna (386663 inhabitants)
75 Km SE of Ferrara (133155 inhabitants)
78 Km NE of Firenze (382808 inhabitants)
80 Km W of Pesaro (94582 inhabitants)
81 Km E of Prato (191150 inhabitants)
83 Km NE of Scandicci (50609 inhabitants)
84 Km N of Arezzo (99543 inhabitants)
91 Km W of Fano (60888 inhabitants)
92 Km E of Pistoia (90315 inhabitants)
97 Km S of Rovigo (51867 inhabitants)
98 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 1.3 2021-08-07
16:14:38		 44.2163 12.0022 21 2021-12-29
11:12:33		 Bollettino Sismico Italiano INGV 95984691
Reviewed
Rev100 		ML 1.4 2021-08-07
16:14:38		 44.2492 11.9625 26 2021-08-07
16:29:16		 Sala Sismica INGV-Roma 93807651
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-07 16:14:38 ± 0.29
Latitude 44.2163 ± 0.0099
Longitude 12.0022 ± 0.0238
Depth (km) 21 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 95984691

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1526
Semi-minor axis of confidence ellipse (meter) 1317
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 291
Circular confidence region, given by single value of horizontal uncertainty (meter) 1530.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 214
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.34
Epicentral distance of station closest to the epicenter (degree) 0.11601
Epicentral distance of station farthest from the epicenter (degree) 0.59265
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitudes information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 95984691
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-09-28 09:16:14

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 93807651
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-07 16:29:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RUFI.EHZ. 2021-08-07T16:14:57.26 0.6 undecidable manual S 223 57.498 102 0.29 48
IV.ASQU.HHZ. 2021-08-07T16:14:55.70 0.6 undecidable manual S 200 49.5171 105 0.78 41
IV.VISG.HHZ. 2021-08-07T16:14:54.00 1.0 undecidable manual S 266 45.2214 107 0.19 25
IV.PARC.HHE. 2021-08-07T16:14:51.04 0.3 undecidable manual P 163 65.7897 101 0.47 66
IV.SFI.EHZ. 2021-08-07T16:14:51.96 0.6 undecidable manual S 200 36.741 111 0.31 49
IV.IMOL.EHZ. 2021-08-07T16:14:50.40 1.0 undecidable manual S 308 26.0517 121 1.31 17
IV.LMD.HHZ. 2021-08-07T16:14:49.15 0.6 undecidable manual S 237 28.0497 119 -0.42 48
IV.RUFI.EHZ. 2021-08-07T16:14:49.03 0.1 undecidable manual P 223 57.498 102 -0.3 94
IV.VISG.HHZ. 2021-08-07T16:14:47.44 0.3 undecidable manual P 266 45.2214 107 -0.06 76
IV.ASQU.HHZ. 2021-08-07T16:14:47.97 0.3 undecidable manual P 200 49.5171 105 -0.17 74
IV.FAEN.HNZ. 2021-08-07T16:14:47.16 0.6 undecidable manual S 309 12.876 144 0.69 45
IV.BRIS.HHZ. 2021-08-07T16:14:47.23 0.3 undecidable manual S 273 18.7701 132 -0.3 75
IV.SFI.EHZ. 2021-08-07T16:14:46.05 0.1 undecidable manual P 200 36.741 111 -0.2 100
IV.IMOL.EHZ. 2021-08-07T16:14:45.02 0.3 undecidable manual P 308 26.0517 121 0.24 75
IV.LMD.HHZ. 2021-08-07T16:14:44.61 0.3 undecidable manual P 237 28.0497 119 -0.44 72
IV.FAEN.HNZ. 2021-08-07T16:14:43.38 1.0 undecidable manual P 309 12.876 144 0.12 26
IV.BRIS.HHZ. 2021-08-07T16:14:43.47 0.1 positive manual P 273 18.7701 132 -0.4 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BRIS.HNN. ML:1.2 0.000092531895 0.7168 AML other m 2021-08-07T16:14:47.56
IV.BRIS.HHN. ML:1.6 0.00023378642500000002 0.1024 AML other m 2021-08-07T16:14:47.47
IV.BRIS.HHE. ML:2.0 0.0005769999999999999 0.32 AML other m 2021-08-07T16:14:47.34
IV.BRIS.HNE. ML:0.9 0.000045266379999999996 0.5632 AML other m 2021-08-07T16:14:47.99
IV.LMD.HHE. ML:1.6 0.000168 0.18 AML other m 2021-08-07T16:14:49.55
IV.LMD.HHN. ML:1.7 0.0001965 0.16 AML other m 2021-08-07T16:14:50.55
IV.SFI.EHE. ML:1.4 0.0000838 1.7 AML other m 2021-08-07T16:14:52.94
IV.SFI.HNN. ML:1.5 0.00011744915 1.1552 AML other m 2021-08-07T16:14:53.20
IV.SFI.EHN. ML:1.2 0.000054495215 0.1408 AML other m 2021-08-07T16:14:53.40
IV.SFI.HNE. ML:1.5 0.00011224639 0.2816 AML other m 2021-08-07T16:14:53.57
IV.VISG.HHE. ML:1.0 0.000027049999999999997 0.32 AML other m 2021-08-07T16:14:54.94
IV.VISG.HHN. ML:1.0 0.000022555894999999998 0.1024 AML other m 2021-08-07T16:14:55.10
IV.RUFI.EHE. ML:1.1 0.0000254379625 0.3968 AML other m 2021-08-07T16:14:57.45
IV.ASQU.HHE. ML:1.2 0.00003784999999999999 1.28 AML other m 2021-08-07T16:14:57.97
IV.ASQU.HHN. ML:1.2 0.0000380715 0.3456 AML other m 2021-08-07T16:14:57.73
IV.RUFI.EHN. ML:1.1 0.000025073715 0.2688 AML other m 2021-08-07T16:14:58.89
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