Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.1 on date 18-08-2021 and time 10:13:01 (UTC) in region 4 km N Castrocaro Terme e Terra del Sole (FC)

A magnitude ML 2.1 earthquake occured in region: 4 km N Castrocaro Terme e Terra del Sole (FC), on

  • 18-08-2021 10:13:01 (UTC)
  • 18-08-2021 12:13:01 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.2170, 11.9520 at 23 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
Castrocaro Terme e Terra del Sole FC 5 6426 6426
Forlì FC 7 117913 124339
Faenza RA 9 58541 182880
Dovadola FC 12 1653 184533
Predappio FC 13 6346 190879
Meldola FC 13 9970 200849
Modigliana FC 14 4560 205409
Forlimpopoli FC 14 13290 218699
Brisighella RA 15 7639 226338
Bertinoro FC 16 11059 237397
Castel Bolognese RA 17 9554 246951
Solarolo RA 18 4488 251439
Russi RA 19 12247 263686
Cotignola RA 19 7474 271160
Riolo Terme RA 19 5720 276880
Rocca San Casciano FC 19 1910 278790

Municipalities with at least 50000 inhabitants

An earthquake occurred to
7 Km W of Forlì (117913 inhabitants)
9 Km SE of Faenza (58541 inhabitants)
24 Km SE of Imola (69797 inhabitants)
25 Km W of Cesena (96758 inhabitants)
30 Km SW of Ravenna (159116 inhabitants)
52 Km W of Rimini (147750 inhabitants)
58 Km SE of Bologna (386663 inhabitants)
74 Km SE of Ferrara (133155 inhabitants)
75 Km NE of Firenze (382808 inhabitants)
78 Km E of Prato (191150 inhabitants)
80 Km NE of Scandicci (50609 inhabitants)
84 Km N of Arezzo (99543 inhabitants)
84 Km W of Pesaro (94582 inhabitants)
88 Km E of Pistoia (90315 inhabitants)
94 Km SE of Modena (184973 inhabitants)
95 Km W of Fano (60888 inhabitants)
96 Km S of Rovigo (51867 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 2.1 2021-08-18
10:13:01		 44.2172 11.9522 23 2021-12-29
11:12:25		 Bollettino Sismico Italiano INGV 94960631
Reviewed
Rev100 		ML 2.0 2021-08-18
10:13:02		 44.1948 11.9772 9 2021-12-10
13:58:48		 Sala Sismica INGV-Roma 94326421
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-18 10:13:01 ± 0.15
Latitude 44.2172 ± 0.0063
Longitude 11.9522 ± 0.0113
Depth (km) 23 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 94960631

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 862
Semi-minor axis of confidence ellipse (meter) 314
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 64
Circular confidence region, given by single value of horizontal uncertainty (meter) 860.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 144
Number of associated phases, regardless of their use for origin computation 58
Number of defining phases 36
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.38
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 2.09812
Number of stations at which the event was observed 45
Number of stations from which data was used for origin computation 23
Magnitudes information

ML:2.1

Field Value
Value 2.1
Uncertainty 0.3
Num. used stations 32
Type of magnitude ML
Reference to an origin 94960631
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-10 13:58:34

ML:2.0

Field Value
Value 2.0
Uncertainty 0.3
Num. used stations 32
Type of magnitude ML
Reference to an origin 94326421
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-18 10:32:18
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HAGA.HHZ. 2021-08-18T10:14:38.06 3.0 negative manual Pg 9.66 0
IV.MTTG.HHZ. 2021-08-18T10:14:35.12 3.0 positive manual Pg 14.37 0
GU.MGRO.HHZ. 2021-08-18T10:14:30.24 3.0 undecidable manual Sn -3.45 0
GU.CANO.HHZ. 2021-08-18T10:14:26.38 3.0 undecidable manual Sn -0.19 0
IV.PZUN.HHZ. 2021-08-18T10:14:25.54 3.0 undecidable manual Sn -9.09 0
IV.JOPP.HHZ. 2021-08-18T10:14:24.87 3.0 undecidable manual Pg 11.08 0
OT.OT14.EHZ. 2021-08-18T10:14:20.40 3.0 undecidable manual Sg 7.17 0
IV.MILN.HHZ. 2021-08-18T10:14:19.93 3.0 undecidable manual Sn -1.21 0
CR.ZAG.BHZ. 2021-08-18T10:14:17.96 3.0 undecidable manual Sg -1.29 0
GU.BURY.HHZ. 2021-08-18T10:14:08.68 3.0 undecidable manual Pg 18.02 0
IV.SCHR.EHZ. 2021-08-18T10:14:07.74 3.0 undecidable manual Pg 12.27 0
IV.USI.HHZ. 2021-08-18T10:14:06.42 3.0 positive manual Pn 0.64 0
IV.MRB1.HHZ. 2021-08-18T10:14:06.66 3.0 undecidable manual Sn -9.74 0
IV.GIUL.HHZ. 2021-08-18T10:13:57.88 3.0 undecidable manual Sg 2.3 0
GU.RNCA.HHZ. 2021-08-18T10:13:54.20 3.0 undecidable manual Pg 16.139999 0
IV.ORI.HHZ. 2021-08-18T10:13:51.78 3.0 undecidable manual Pn -7.6 0
IV.VIVA.HHZ. 2021-08-18T10:13:50.49 3.0 undecidable manual Sg 0 0
IV.QLNO.HHZ. 2021-08-18T10:13:40.68 3.0 undecidable manual Pn -2.79 0
IV.PAOL.HHZ. 2021-08-18T10:13:37.74 3.0 undecidable manual Pn -0.01 0
IV.MABI.HHZ. 2021-08-18T10:13:36.61 0.3 undecidable manual P 332 232.8891 54 0.17 39
SI.LUSI.HHZ. 2021-08-18T10:13:32.89 0.3 undecidable manual P 338 208.8354 54 -0.56 40
ST.VARA.EHZ. 2021-08-18T10:13:31.54 0.6 undecidable manual P 335 196.7586 54 -0.41 30
IT.GLNS.HNZ. 2021-08-18T10:13:29.27 3.0 undecidable manual Pg -0.15 0
IV.CRE.HHZ. 2021-08-18T10:13:23.60 0.6 undecidable manual S 180 66.378 102 1.17 33
IV.PII.HHZ. 2021-08-18T10:13:23.15 1.0 undecidable manual P 245 126.4734 96 0.23 21
IV.PARC.HHZ. 2021-08-18T10:13:23.50 0.6 undecidable manual S 160 67.0773 102 0.88 38
IV.MF5.EHZ. 2021-08-18T10:13:21.69 3.0 undecidable manual Sg 1.23 0
IV.BOSL.HHZ. 2021-08-18T10:13:20.30 0.6 undecidable manual S 236 55.8996 105 0.58 45
IV.OSSC.HHZ. 2021-08-18T10:13:19.22 0.3 undecidable manual P 217 95.4378 98 1.05 51
IV.RUFI.EHZ. 2021-08-18T10:13:19.60 0.3 undecidable manual S 220 54.9006 105 0.14 74
IV.CAFI.HHZ. 2021-08-18T10:13:18.82 0.3 undecidable manual P 179 98.5236 98 0.18 68
IV.SEI.HHZ. 2021-08-18T10:13:18.40 0.3 undecidable manual S 249 50.616 107 0.05 77
IV.ASQU.HHZ. 2021-08-18T10:13:18.00 0.3 undecidable manual S 196 48.4182 108 0.2 74
IV.VISG.HHZ. 2021-08-18T10:13:16.40 0.6 undecidable manual S 266 41.3253 111 0.39 48
IV.SFI.EHZ. 2021-08-18T10:13:14.40 0.3 undecidable manual S 194 35.6421 115 -0.23 76
IV.PARC.HHZ. 2021-08-18T10:13:13.68 0.3 undecidable manual P 160 67.0773 102 -0.19 72
IV.IMOL.EHZ. 2021-08-18T10:13:13.20 0.6 undecidable manual S 314 22.9548 129 1.47 31
IV.CRE.HHZ. 2021-08-18T10:13:13.51 0.3 undecidable manual P 180 66.378 102 -0.25 71
IV.CPGN.EHZ. 2021-08-18T10:13:12.47 0.3 undecidable manual P 147 54.7008 105 0.45 70
IV.SEI.HHZ. 2021-08-18T10:13:11.18 0.3 undecidable manual P 249 50.616 107 -0.23 74
IV.RSM2.HHE. 2021-08-18T10:13:11.47 0.1 undecidable manual P 128 50.0166 107 0.14 100
IV.BOSL.HHZ. 2021-08-18T10:13:11.97 0.3 undecidable manual P 236 55.8996 105 -0.23 73
IV.RUFI.EHZ. 2021-08-18T10:13:11.72 0.3 undecidable manual P 220 54.9006 105 -0.33 72
IV.MTRZ.HNN. 2021-08-18T10:13:11.04 0.3 undecidable manual P 284 43.2234 110 0.71 65
IV.LMD.HHZ. 2021-08-18T10:13:11.70 0.3 undecidable manual S 232 24.9528 126 -0.45 74
IV.CMPO.HNN. 2021-08-18T10:13:10.84 0.3 undecidable manual P 344 41.9247 111 0.69 66
IT.FAZ.HNZ. 2021-08-18T10:13:10.05 0.6 undecidable manual S 331 10.1787 153 0.5 49
IV.ASQU.HHZ. 2021-08-18T10:13:10.72 0.1 undecidable manual P 196 48.4182 108 -0.37 96
IV.BRIS.HHZ. 2021-08-18T10:13:10.00 0.3 undecidable manual S 273 14.7741 143 -0.2 79
IV.CAMP.HHZ. 2021-08-18T10:13:09.97 3.0 negative manual P -4.16 0
IV.FAEN.HNZ. 2021-08-18T10:13:09.88 0.6 undecidable manual S 323 9.9789 153 0.35 51
IV.VISG.HHZ. 2021-08-18T10:13:09.59 0.3 undecidable manual P 266 41.3253 111 -0.46 71
IV.SFI.EHZ. 2021-08-18T10:13:08.80 0.1 undecidable manual P 194 35.6421 115 -0.45 96
IV.LMD.HHZ. 2021-08-18T10:13:07.17 0.1 positive manual P 232 24.9528 126 -0.65 91
IV.IMOL.EHZ. 2021-08-18T10:13:07.76 0.3 undecidable manual P 314 22.9548 129 0.18 78
IT.FAZ.HNZ. 2021-08-18T10:13:06.00 0.3 undecidable manual P 331 10.1787 153 -0.32 78
IV.BRIS.HHZ. 2021-08-18T10:13:06.20 0.1 positive manual P 273 14.7741 143 -0.5 99
IV.FAEN.HNZ. 2021-08-18T10:13:05.90 0.3 undecidable manual P 323 9.9789 153 -0.41 76
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BRIS.HHE. ML:2.8 0.00395 0.3 AML other m 2021-08-18T10:13:10.09
IV.BRIS.HHN. ML:2.6 0.00256 0.4 AML other m 2021-08-18T10:13:10.22
IV.LMD.HHE. ML:2.4 0.0010235 0.16 AML other m 2021-08-18T10:13:12.28
IV.LMD.HHN. ML:2.5 0.0014199999999999998 0.16 AML other m 2021-08-18T10:13:13.27
IV.IMOL.HNE. ML:2.2 0.000744 0.6 AML other m 2021-08-18T10:13:14.78
IV.IMOL.HNN. ML:2.2 0.0008315 1.12 AML other m 2021-08-18T10:13:14.02
IV.SFI.EHN. ML:2.2 0.00047750000000000006 1.1 AML other m 2021-08-18T10:13:15.31
IV.SFI.HNN. ML:2.2 0.0004955000000000001 1.1 AML other m 2021-08-18T10:13:15.31
IV.SFI.HNE. ML:2.2 0.000565 0.94 AML other m 2021-08-18T10:13:15.66
IV.SFI.EHE. ML:2.2 0.0005619999999999999 0.96 AML other m 2021-08-18T10:13:15.66
IV.VISG.HHE. ML:1.8 0.00017749999999999998 0.66 AML other m 2021-08-18T10:13:17.68
IV.VISG.HHN. ML:2.0 0.00027100000000000003 0.22 AML other m 2021-08-18T10:13:17.85
IV.ASQU.HHE. ML:2.0 0.000273 0.42 AML other m 2021-08-18T10:13:18.79
IV.SEI.HHN. ML:2.6 0.000919 0.22 AML other m 2021-08-18T10:13:20.41
IV.ASQU.HHN. ML:2.1 0.00028149999999999996 0.28 AML other m 2021-08-18T10:13:20.31
IV.RUFI.EHE. ML:2.0 0.00019024999999999996 0.86 AML other m 2021-08-18T10:13:20.16
IV.SEI.HHE. ML:2.2 0.00035299999999999996 0.96 AML other m 2021-08-18T10:13:21.17
IV.RUFI.EHN. ML:1.9 0.00017400000000000003 0.64 AML other m 2021-08-18T10:13:21.96
IV.BOSL.HHE. ML:1.4 0.000056750000000000004 1.22 AML other m 2021-08-18T10:13:22.17
IV.BOSL.HHN. ML:1.6 0.0000901 0.52 AML other m 2021-08-18T10:13:24.46
IV.CRE.HHN. ML:2.1 0.00020150000000000002 0.4 AML other m 2021-08-18T10:13:24.79
IV.CRE.HHE. ML:1.8 0.00011999999999999999 1.58 AML other m 2021-08-18T10:13:25.20
IV.OSSC.HHE. ML:1.9 0.0000812 0.44 AML other m 2021-08-18T10:13:32.60
IV.OSSC.HHN. ML:1.9 0.0000789 0.46 AML other m 2021-08-18T10:13:36.47
IV.CAFI.HHE. ML:1.8 0.00006245 0.56 AML other m 2021-08-18T10:13:37.03
ST.VARA.EHN. ML:1.7 0.000015244999999999999 0.94 AML other m 2021-08-18T10:13:37.37
IV.CAFI.HHN. ML:1.6 0.00003565 0.5 AML other m 2021-08-18T10:13:39.58
IV.PII.HHN. ML:2.2 0.00010875 1.7 AML other m 2021-08-18T10:13:42.98
IV.PII.HHE. ML:2.0 0.00007075000000000001 1.22 AML other m 2021-08-18T10:13:45.79
ST.VARA.EHE. ML:2.6 0.00011265 0.84 AML other m 2021-08-18T10:14:02.66
SI.LUSI.HHE. ML:2.2 0.0000426 0.9 AML other m 2021-08-18T10:14:06.38
SI.LUSI.HHN. ML:2.4 0.00006515 1.78 AML other m 2021-08-18T10:14:10.95
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
Waveforms Seismic signals in miniseed + resp format Download