Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 26-07-2021 and time 19:23:56 (Italy) in region 5 km NE Castrocaro Terme e Terra del Sole (FC)

A magnitude ML 1.7 earthquake occured in region: 5 km NE Castrocaro Terme e Terra del Sole (FC), on

  • 26-07-2021 17:23:56 (UTC)
  • 26-07-2021 19:23:56 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.2150, 11.9720 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

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 6 117913 124339
Faenza RA 11 58541 182880
Meldola FC 12 9970 192850
Dovadola FC 12 1653 194503
Predappio FC 13 6346 200849
Forlimpopoli FC 13 13290 214139
Bertinoro FC 15 11059 225198
Modigliana FC 16 4560 229758
Brisighella RA 16 7639 237397
Castel Bolognese RA 18 9554 246951
Russi RA 18 12247 259198
Cotignola RA 19 7474 266672
Solarolo RA 19 4488 271160
Rocca San Casciano FC 20 1910 273070

Municipalities with at least 50000 inhabitants

An earthquake occurred to
6 Km W of Forlì (117913 inhabitants)
11 Km SE of Faenza (58541 inhabitants)
23 Km W of Cesena (96758 inhabitants)
26 Km SE of Imola (69797 inhabitants)
29 Km SW of Ravenna (159116 inhabitants)
50 Km W of Rimini (147750 inhabitants)
59 Km SE of Bologna (386663 inhabitants)
75 Km SE of Ferrara (133155 inhabitants)
76 Km NE of Firenze (382808 inhabitants)
79 Km E of Prato (191150 inhabitants)
81 Km NE of Scandicci (50609 inhabitants)
83 Km W of Pesaro (94582 inhabitants)
84 Km N of Arezzo (99543 inhabitants)
90 Km E of Pistoia (90315 inhabitants)
94 Km W of Fano (60888 inhabitants)
96 Km E of Modena (184973 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 1.7 2021-07-26
17:23:56		 44.2153 11.9717 23 2021-12-29
11:12:51		 Bollettino Sismico Italiano INGV 97365541
Reviewed
Rev100 		ML 1.6 2021-07-26
17:23:57		 44.1872 11.9905 9 2021-07-26
17:30:08		 Sala Sismica INGV-Roma 93246421
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-26 17:23:56 ± 0.34
Latitude 44.2153 ± 0.0126
Longitude 11.9717 ± 0.0188
Depth (km) 23 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97365541

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1360
Semi-minor axis of confidence ellipse (meter) 1078
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 96
Circular confidence region, given by single value of horizontal uncertainty (meter) 1360.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 101
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.45
Epicentral distance of station closest to the epicenter (degree) 0.10342
Epicentral distance of station farthest from the epicenter (degree) 0.79140
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 93246421
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-26 17:30:08

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 97365541
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-09 16:43:41
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RUFI.EHZ. 2021-07-26T17:24:14.84 0.3 undecidable manual S 222 55.7997 105 0.38 70
IV.ASQU.HHZ. 2021-07-26T17:24:13.35 0.6 undecidable manual S 197 48.618 108 0.71 43
IV.SEI.HHZ. 2021-07-26T17:24:13.81 0.6 undecidable manual S 250 52.0035 107 0.32 47
IV.PIEI.HHZ. 2021-07-26T17:24:12.62 0.3 undecidable manual P 149 87.8454 99 0.84 57
IV.VISG.HHZ. 2021-07-26T17:24:11.78 0.6 undecidable manual S 266 42.8238 111 0.61 44
IV.SFI.EHZ. 2021-07-26T17:24:09.68 0.3 undecidable manual S 196 35.8419 115 0.22 75
IV.CRE.HHZ. 2021-07-26T17:24:08.86 0.3 undecidable manual P 181 66.1893 103 0.35 69
IV.IMOL.EHZ. 2021-07-26T17:24:08.21 0.6 undecidable manual S 311 24.2535 127 1.41 31
IV.LMD.HHZ. 2021-07-26T17:24:06.79 0.3 undecidable manual S 234 26.0517 125 -0.39 74
IV.MTRZ.HNN. 2021-07-26T17:24:06.22 0.3 undecidable manual P 284 44.8218 110 0.89 58
IV.RUFI.EHZ. 2021-07-26T17:24:06.68 0.1 undecidable manual P 222 55.7997 105 -0.27 96
IV.SEI.HHZ. 2021-07-26T17:24:06.07 0.3 undecidable manual P 250 52.0035 107 -0.31 72
IV.ASQU.HHZ. 2021-07-26T17:24:05.61 0.1 undecidable manual P 197 48.618 108 -0.29 96
IV.BRSN.EHZ. 2021-07-26T17:24:05.32 0.6 undecidable manual S 48 11.4774 150 0.79 45
IV.VISG.HHZ. 2021-07-26T17:24:04.74 0.3 undecidable manual P 266 42.8238 111 -0.31 73
IV.BRIS.HHZ. 2021-07-26T17:24:04.89 0.3 undecidable manual S 274 16.3725 140 -0.38 75
IV.SFI.EHZ. 2021-07-26T17:24:03.68 0.1 undecidable manual P 196 35.8419 115 -0.38 96
IV.LMD.HHZ. 2021-07-26T17:24:02.13 0.1 undecidable manual P 234 26.0517 125 -0.62 92
IV.IMOL.EHZ. 2021-07-26T17:24:02.94 0.6 undecidable manual P 311 24.2535 127 0.42 49
IV.BRIS.HHZ. 2021-07-26T17:24:01.11 0.1 positive manual P 274 16.3725 140 -0.53 97
IV.BRSN.EHZ. 2021-07-26T17:24:00.82 0.1 undecidable manual P 48 11.4774 150 -0.39 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BRIS.HHE. ML:2.4 0.0012900000000000001 1.68 AML other m 2021-07-26T17:24:05.99
IV.BRIS.HHN. ML:2.1 0.0007725 0.42 AML other m 2021-07-26T17:24:05.12
IV.LMD.HHE. ML:1.9 0.0003205 1.36 AML other m 2021-07-26T17:24:07.19
IV.LMD.HHN. ML:2.0 0.00044 0.14 AML other m 2021-07-26T17:24:08.19
IV.SFI.EHN. ML:1.7 0.00016549999999999998 0.3 AML other m 2021-07-26T17:24:10.27
IV.SFI.EHE. ML:1.7 0.00017150000000000002 1 AML other m 2021-07-26T17:24:10.58
IV.VISG.HHE. ML:1.3 0.00005945 0.92 AML other m 2021-07-26T17:24:12.59
IV.VISG.HHN. ML:1.4 0.0000707 0.24 AML other m 2021-07-26T17:24:12.75
IV.ASQU.HHE. ML:1.5 0.0000779 0.38 AML other m 2021-07-26T17:24:14.54
IV.ASQU.HHN. ML:1.5 0.0000872 0.72 AML other m 2021-07-26T17:24:15.38
IV.PIEI.HHN. ML:1.1 0.0000168 0.34 AML other m 2021-07-26T17:24:29.81
IV.PIEI.HHE. ML:1.3 0.000024750000000000002 0.72 AML other m 2021-07-26T17:24:30.90
IV.COR1.EHN. ML:2.2 0.0001316 1.54 AML other m 2021-07-26T17:24:39.91
IV.COR1.EHE. ML:2.0 0.00009185 1.48 AML other m 2021-07-26T17:24:45.20
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