Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 15-08-2021 and time 08:04:25 (Italy) in region 7 km W Forlì (FC)

A magnitude ML 1.4 earthquake occured in region: 7 km W Forlì (FC), on

  • 15-08-2021 06:04:25 (UTC)
  • 15-08-2021 08:04:25 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.2400, 11.9620 at 26 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
Forlì FC 7 117913 117913
Castrocaro Terme e Terra del Sole FC 7 6426 124339
Faenza RA 8 58541 182880
Dovadola FC 14 1653 184533
Forlimpopoli FC 14 13290 197823
Meldola FC 15 9970 207793
Predappio FC 15 6346 214139
Brisighella RA 15 7639 221778
Castel Bolognese RA 16 9554 231332
Russi RA 16 12247 243579
Cotignola RA 16 7474 251053
Modigliana FC 16 4560 255613
Solarolo RA 16 4488 260101
Bertinoro FC 17 11059 271160
Riolo Terme RA 19 5720 276880
Bagnacavallo RA 20 16739 293619
Bagnara di Romagna RA 20 2429 296048

Municipalities with at least 50000 inhabitants

An earthquake occurred to
7 Km W of Forlì (117913 inhabitants)
8 Km SE of Faenza (58541 inhabitants)
23 Km SE of Imola (69797 inhabitants)
25 Km W of Cesena (96758 inhabitants)
27 Km SW of Ravenna (159116 inhabitants)
52 Km W of Rimini (147750 inhabitants)
57 Km E of Bologna (386663 inhabitants)
72 Km SE of Ferrara (133155 inhabitants)
77 Km NE of Firenze (382808 inhabitants)
80 Km NE of Prato (191150 inhabitants)
82 Km NE of Scandicci (50609 inhabitants)
84 Km W of Pesaro (94582 inhabitants)
86 Km N of Arezzo (99543 inhabitants)
90 Km E of Pistoia (90315 inhabitants)
94 Km S of Rovigo (51867 inhabitants)
94 Km E of Modena (184973 inhabitants)
95 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 1.4 2021-08-15
06:04:25		 44.2397 11.9623 26 2021-12-29
11:12:33		 Bollettino Sismico Italiano INGV 95949621
Reviewed
Rev100 		ML 1.3 2021-08-15
06:04:25		 44.2467 11.9598 22 2021-08-15
06:56:21		 Sala Sismica INGV-Roma 94181431
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-15 06:04:25 ± 0.34
Latitude 44.2397 ± 0.0126
Longitude 11.9623 ± 0.0151
Depth (km) 26 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 95949621

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1215
Semi-minor axis of confidence ellipse (meter) 1091
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 255
Circular confidence region, given by single value of horizontal uncertainty (meter) 1220.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 113
Number of associated phases, regardless of their use for origin computation 34
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.41
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.62323
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 95949621
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-09-27 14:56:46

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 94181431
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-15 06:56:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SACR.HHZ. 2021-08-15T06:06:07.45 3.0 undecidable manual Sn 2.9 0
OX.CIMO.HHZ. 2021-08-15T06:05:34.07 3.0 undecidable manual Sg 1.36 0
MN.BNI.HHZ. 2021-08-15T06:05:28.52 3.0 undecidable manual Pn 4.23 0
IV.PIGN.HHZ. 2021-08-15T06:05:16.85 3.0 undecidable manual Pn -4.35 0
IV.FDMO.HHZ. 2021-08-15T06:05:15.73 3.0 undecidable manual Sg 0.75 0
IV.EUCT.HNZ. 2021-08-15T06:05:08.18 3.0 undecidable manual Pg 5.68 0
ST.OZOL.EHZ. 2021-08-15T06:05:01.98 3.0 negative manual Pn -3.19 0
NI.POLC.HHZ. 2021-08-15T06:04:59.33 3.0 positive manual Pn -1.22 0
IV.VOBA.EHZ. 2021-08-15T06:04:55.94 3.0 negative manual Pn -1.21 0
IV.PARC.HHN. 2021-08-15T06:04:48.12 0.6 undecidable manual S 161 69.1752 105 1.11 35
IV.CRE.HHZ. 2021-08-15T06:04:47.84 0.6 undecidable manual S 181 68.8755 105 0.91 38
IV.SSFR.HNZ. 2021-08-15T06:04:47.86 3.0 positive manual P -0.3 0
IV.RUFI.EHZ. 2021-08-15T06:04:44.23 0.6 undecidable manual S 219 57.2982 108 0.25 47
IV.SEI.HHZ. 2021-08-15T06:04:43.04 0.6 undecidable manual S 247 52.3032 110 0.34 46
IV.ASQU.HHZ. 2021-08-15T06:04:42.50 0.6 undecidable manual S 196 51.0156 111 0.1 49
IV.VISG.HHZ. 2021-08-15T06:04:41.03 0.6 undecidable manual S 263 42.3243 116 0.76 41
IV.PARC.HHN. 2021-08-15T06:04:38.08 0.3 undecidable manual P 161 69.1752 105 0.14 71
IV.CRE.HHZ. 2021-08-15T06:04:38.51 0.3 undecidable manual P 181 68.8755 105 0.62 63
IV.SFI.EHZ. 2021-08-15T06:04:38.90 0.6 undecidable manual S 194 38.2284 118 -0.39 46
IV.IMOL.HNZ. 2021-08-15T06:04:37.17 0.6 undecidable manual S 307 21.9669 136 1.39 31
IV.LMD.HHZ. 2021-08-15T06:04:36.07 0.6 undecidable manual S 229 27.1506 129 -0.74 42
IV.SEI.HHZ. 2021-08-15T06:04:35.42 0.3 undecidable manual P 247 52.3032 110 -0.03 74
IV.RUFI.EHZ. 2021-08-15T06:04:35.96 0.3 undecidable manual P 219 57.2982 108 -0.23 70
IV.FAEN.HNZ. 2021-08-15T06:04:34.04 0.6 undecidable manual S 309 8.7801 160 0.17 52
IV.BRIS.HHZ. 2021-08-15T06:04:34.18 0.6 undecidable manual S 264 15.6732 146 -0.54 47
IV.ASQU.HHZ. 2021-08-15T06:04:34.94 0.3 undecidable manual P 196 51.0156 111 -0.34 69
IV.BRSN.HNE. 2021-08-15T06:04:34.50 0.6 undecidable manual S 62 10.5783 156 0.45 49
IV.VISG.HHZ. 2021-08-15T06:04:33.51 1.0 undecidable manual P 263 42.3243 116 -0.54 22
IV.SFI.EHZ. 2021-08-15T06:04:32.93 0.1 undecidable manual P 194 38.2284 118 -0.55 88
IV.IMOL.HNZ. 2021-08-15T06:04:31.64 0.6 undecidable manual P 307 21.9669 136 0.18 50
IV.LMD.HHZ. 2021-08-15T06:04:31.39 0.1 undecidable manual P 229 27.1506 129 -0.66 87
IV.FAEN.HNZ. 2021-08-15T06:04:30.98 0.6 undecidable manual P 309 8.7801 160 0.63 46
IV.BRIS.HHZ. 2021-08-15T06:04:30.44 0.1 positive manual P 264 15.6732 146 -0.4 97
IV.BRSN.HNE. 2021-08-15T06:04:30.15 0.1 undecidable manual P 62 10.5783 156 -0.31 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BRIS.HHE. ML:1.9 0.000417 0.3 AML other m 2021-08-15T06:04:34.31
IV.BRIS.HHN. ML:1.7 0.00025886750000000004 0.24 AML other m 2021-08-15T06:04:34.52
IV.BRIS.HNE. ML:1.2 0.00007716199999999999 0.64 AML other m 2021-08-15T06:04:35.86
IV.LMD.HHE. ML:1.5 0.000131 0.28 AML other m 2021-08-15T06:04:36.64
IV.LMD.HHN. ML:1.6 0.0001668463 0.1024 AML other m 2021-08-15T06:04:36.61
IV.BRIS.HNN. ML:1.4 0.00013243844499999998 0.7296 AML other m 2021-08-15T06:04:36.49
IV.SFI.EHN. ML:1.1 0.000036132565 0.1216 AML other m 2021-08-15T06:04:39.31
IV.SFI.EHE. ML:1.3 0.000057201354999999994 0.1824 AML other m 2021-08-15T06:04:39.88
IV.ASQU.HHE. ML:1.3 0.0000408 1.58 AML other m 2021-08-15T06:04:43.81
IV.ASQU.HHN. ML:1.2 0.0000341 0.74 AML other m 2021-08-15T06:04:43.55
IV.SEI.HHN. ML:1.6 0.00008335 0.2 AML other m 2021-08-15T06:04:44.64
IV.SEI.HHE. ML:1.4 0.000048799999999999994 0.28 AML other m 2021-08-15T06:04:45.40
IV.CRE.HHN. ML:1.2 0.0000275 1.58 AML other m 2021-08-15T06:04:48.82
IV.CRE.HHE. ML:1.0 0.0000162 1.14 AML other m 2021-08-15T06:04:49.98
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