Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 07-08-2021 and time 17:59:36 (Italy) in region 6 km NW Castrocaro Terme e Terra del Sole (FC)

A magnitude ML 1.7 earthquake occured in region: 6 km NW Castrocaro Terme e Terra del Sole (FC), on

  • 07-08-2021 15:59:36 (UTC)
  • 07-08-2021 17:59:36 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.2250, 11.9220 at 25 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 6 6426 6426
Faenza RA 7 58541 64967
Forlì FC 10 117913 182880
Dovadola FC 12 1653 184533
Brisighella RA 12 7639 192172
Modigliana FC 13 4560 196732
Castel Bolognese RA 14 9554 206286
Predappio FC 14 6346 212632
Meldola FC 16 9970 222602
Solarolo RA 16 4488 227090
Riolo Terme RA 17 5720 232810
Forlimpopoli FC 17 13290 246100
Cotignola RA 18 7474 253574
Russi RA 19 12247 265821
Bertinoro FC 19 11059 276880
Rocca San Casciano FC 19 1910 278790
Bagnara di Romagna RA 20 2429 281219

Municipalities with at least 50000 inhabitants

An earthquake occurred to
7 Km SE of Faenza (58541 inhabitants)
10 Km W of Forlì (117913 inhabitants)
22 Km SE of Imola (69797 inhabitants)
27 Km W of Cesena (96758 inhabitants)
31 Km SW of Ravenna (159116 inhabitants)
55 Km W of Rimini (147750 inhabitants)
55 Km SE of Bologna (386663 inhabitants)
72 Km SE of Ferrara (133155 inhabitants)
73 Km NE of Firenze (382808 inhabitants)
76 Km NE of Prato (191150 inhabitants)
79 Km NE of Scandicci (50609 inhabitants)
84 Km N of Arezzo (99543 inhabitants)
86 Km E of Pistoia (90315 inhabitants)
87 Km W of Pesaro (94582 inhabitants)
92 Km SE of Modena (184973 inhabitants)
95 Km S of Rovigo (51867 inhabitants)
98 Km W of Fano (60888 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 1.7 2021-08-07
15:59:36		 44.2252 11.9218 25 2021-12-29
11:12:23		 Bollettino Sismico Italiano INGV 94877231
Reviewed
Rev100 		ML 1.5 2021-08-07
15:59:37		 44.1918 12.0053 9 2021-08-07
16:11:07		 Sala Sismica INGV-Roma 93807211
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-07 15:59:36 ± 0.31
Latitude 44.2252 ± 0.0117
Longitude 11.9218 ± 0.0176
Depth (km) 25 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 94877231

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1315
Semi-minor axis of confidence ellipse (meter) 999
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 89
Circular confidence region, given by single value of horizontal uncertainty (meter) 1320.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 119
Number of associated phases, regardless of their use for origin computation 25
Number of defining phases 25
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.43
Epicentral distance of station closest to the epicenter (degree) 0.07195
Epicentral distance of station farthest from the epicenter (degree) 0.84716
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.4
Num. used stations 13
Type of magnitude ML
Reference to an origin 94877231
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-09-28 09:14:01

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 93807211
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-07 16:11:07
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CRE.HHE. 2021-08-07T15:59:58.51 0.6 undecidable manual S 178 67.2771 104 0.81 40
IV.PARC.HHE. 2021-08-07T15:59:58.83 0.3 undecidable manual S 158 68.7756 104 0.75 62
IV.RUFI.EHZ. 2021-08-07T15:59:54.86 0.3 undecidable manual S 218 54.1014 109 0.54 68
IV.MPAG.EHE. 2021-08-07T15:59:53.60 0.3 undecidable manual P 134 94.0392 100 0.7 61
IV.ASQU.HHN. 2021-08-07T15:59:53.20 0.3 undecidable manual S 193 48.7179 111 0.24 74
IV.VISG.HHZ. 2021-08-07T15:59:51.76 0.3 undecidable manual S 264 38.9277 117 1.18 53
IV.SFI.EHZ. 2021-08-07T15:59:49.65 0.3 undecidable manual S 190 36.0417 119 -0.24 77
IV.CRE.HHE. 2021-08-07T15:59:48.56 0.6 undecidable manual P 178 67.2771 104 -0.3 47
IV.IMOL.EHZ. 2021-08-07T15:59:48.12 0.6 undecidable manual S 316 20.6682 136 1.53 31
IV.PARC.HHE. 2021-08-07T15:59:48.64 0.3 undecidable manual P 158 68.7756 104 -0.44 69
IV.CPGN.EHZ. 2021-08-07T15:59:47.63 0.3 undecidable manual P 146 56.7987 108 0.32 73
IV.RUFI.EHZ. 2021-08-07T15:59:46.72 0.1 undecidable manual P 218 54.1014 109 -0.19 100
IV.LMD.HHZ. 2021-08-07T15:59:46.81 0.3 undecidable manual S 226 23.6541 132 -0.37 77
IV.VISG.HHZ. 2021-08-07T15:59:45.00 0.3 undecidable manual P 264 38.9277 117 0.25 76
IV.BLLA.EHE. 2021-08-07T15:59:45.24 1.0 undecidable manual P 102 44.622 113 -0.3 25
IT.FAZ.HNZ. 2021-08-07T15:59:45.04 0.6 undecidable manual S 343 8.4804 159 0.2 54
IV.ASQU.HHN. 2021-08-07T15:59:45.71 0.1 undecidable manual P 193 48.7179 111 -0.41 96
IV.BRIS.HHZ. 2021-08-07T15:59:44.94 0.3 undecidable manual S 270 12.3765 151 -0.33 79
IV.FAEN.HNZ. 2021-08-07T15:59:44.89 0.6 undecidable manual S 334 7.9809 160 0.1 55
IV.SFI.EHZ. 2021-08-07T15:59:43.85 0.1 undecidable manual P 190 36.0417 119 -0.5 97
IV.LMD.HHZ. 2021-08-07T15:59:42.16 0.1 undecidable manual P 226 23.6541 132 -0.63 94
IV.IMOL.EHZ. 2021-08-07T15:59:42.87 0.3 undecidable manual P 316 20.6682 136 0.42 76
IV.BRIS.HHZ. 2021-08-07T15:59:41.18 0.1 undecidable manual P 270 12.3765 151 -0.51 100
IT.FAZ.HNZ. 2021-08-07T15:59:41.17 0.6 undecidable manual P 343 8.4804 159 -0.26 53
IV.FAEN.HNZ. 2021-08-07T15:59:41.23 0.3 undecidable manual P 334 7.9809 160 -0.18 81
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.IMOL.HNE. ML:2.4 0.0011553997000000001 0.064 AML other m 2021-08-07T15:59:42.72
IV.IMOL.HNN. ML:2.2 0.0008173127499999999 0.064 AML other m 2021-08-07T15:59:43.86
IV.BRIS.HHE. ML:2.3 0.00120647415 0.2944 AML other m 2021-08-07T15:59:45.08
IV.BRIS.HHN. ML:2.1 0.000778 0.38 AML other m 2021-08-07T15:59:45.22
IV.LMD.HHE. ML:1.9 0.00035943724999999997 0.1536 AML other m 2021-08-07T15:59:47.27
IV.LMD.HHN. ML:2.0 0.000477 0.16 AML other m 2021-08-07T15:59:48.27
IV.VISG.HHE. ML:1.3 0.000055816685 0.32 AML other m 2021-08-07T15:59:52.67
IV.VISG.HHN. ML:1.4 0.00008049999999999999 0.24 AML other m 2021-08-07T15:59:52.73
IV.RUFI.EHE. ML:1.4 0.000050641938499999996 1.6416 AML other m 2021-08-07T15:59:54.16
IV.RUFI.EHN. ML:1.4 0.000051663135 0.2816 AML other m 2021-08-07T15:59:56.49
IV.CPGN.HNE. ML:1.8 0.00011285595000000002 1.0112 AML other m 2021-08-07T15:59:57.59
IV.CPGN.EHE. ML:1.4 0.000044378055 0.4096 AML other m 2021-08-07T15:59:58.84
IV.CPGN.EHN. ML:1.4 0.00004563265 0.4992 AML other m 2021-08-07T16:00:00.72
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