Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 29-08-2021 and time 13:28:27 (UTC) in region 6 km W Portico e San Benedetto (FC)

A magnitude ML 1.4 earthquake occured in region: 6 km W Portico e San Benedetto (FC), on

  • 29-08-2021 13:28:27 (UTC)
  • 29-08-2021 15:28:27 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0310, 11.7090 at 7 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Portico e San Benedetto FC 6 756 756
Tredozio FC 6 1212 1968
Premilcuore FC 8 799 2767
Marradi FI 9 3139 5906
Rocca San Casciano FC 11 1910 7816
San Godenzo FI 14 1167 8983
Modigliana FC 16 4560 13543
Palazzuolo sul Senio FI 16 1154 14697
Galeata FC 17 2516 17213
Dovadola FC 18 1653 18866
Santa Sofia FC 19 4136 23002
Civitella di Romagna FC 19 3786 26788

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km SW of Faenza (58541 inhabitants)
34 Km SW of Forlì (117913 inhabitants)
36 Km S of Imola (69797 inhabitants)
44 Km W of Cesena (96758 inhabitants)
46 Km NE of Firenze (382808 inhabitants)
52 Km E of Prato (191150 inhabitants)
52 Km NE of Scandicci (50609 inhabitants)
58 Km SW of Ravenna (159116 inhabitants)
59 Km SE of Bologna (386663 inhabitants)
64 Km E of Pistoia (90315 inhabitants)
64 Km N of Arezzo (99543 inhabitants)
69 Km W of Rimini (147750 inhabitants)
85 Km NE of Siena (53903 inhabitants)
90 Km S of Ferrara (133155 inhabitants)
93 Km SE of Modena (184973 inhabitants)
97 Km W of Pesaro (94582 inhabitants)
99 Km E of Lucca (89046 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
Reviewed
Rev100 		ML 1.4 2021-08-29
13:28:27		 44.0312 11.709 7 2021-08-29
13:38:09		 Sala Sismica INGV-Roma 94784291
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-29 13:28:27 ± 0.08
Latitude 44.0312 ± 0.0036
Longitude 11.7090 ± 0.0063
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94784291

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 515
Semi-minor axis of confidence ellipse (meter) 208
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 259
Circular confidence region, given by single value of horizontal uncertainty (meter) 510.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 130
Number of associated phases, regardless of their use for origin computation 31
Number of defining phases 19
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.44786
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 94784291
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-29 13:38:09
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IX.SCL3.EHZ.02 2021-08-29T13:30:26.64 3.0 undecidable manual Sn 0.54 0
IV.MRB1.HHZ. 2021-08-29T13:30:18.93 3.0 undecidable manual Sg 7.23 0
IV.GIZZ.HHZ. 2021-08-29T13:30:12.63 3.0 negative manual Pg 15.56 0
IV.PIPA.HHZ. 2021-08-29T13:30:07.27 3.0 undecidable manual Pg 12.29 0
IV.RNI2.HHZ. 2021-08-29T13:30:01.23 3.0 undecidable manual Sg 9.79 0
GU.MGRO.HHZ. 2021-08-29T13:29:51.68 3.0 undecidable manual Sn 1.47 0
IV.VIVA.HHZ. 2021-08-29T13:29:38.29 3.0 undecidable manual Sn -1.26 0
IV.CSFT.HHZ. 2021-08-29T13:29:29.62 3.0 undecidable manual Pg 5.36 0
IV.VBKN.HHZ. 2021-08-29T13:29:24.10 3.0 negative manual Pn -1.57 0
IV.ZEN8.EHZ. 2021-08-29T13:29:23.37 3.0 undecidable manual Sg 2.55 0
IV.PTRJ.HHZ. 2021-08-29T13:29:21.06 3.0 undecidable manual Pn 1.06 0
IV.SBPO.HNZ. 2021-08-29T13:28:47.78 3.0 positive manual P -1.16 0
IV.CRE.HHZ. 2021-08-29T13:28:44.38 0.6 undecidable manual S 157 49.7169 50 -0.02 47
IV.SEI.HHZ. 2021-08-29T13:28:38.13 0.6 undecidable manual S 275 28.0497 104 0.3 46
IV.VISG.HHZ. 2021-08-29T13:28:37.80 0.6 undecidable manual S 309 28.0497 104 -0.01 49
IV.RUFI.EHZ. 2021-08-29T13:28:37.55 0.3 undecidable manual S 217 26.751 105 0.18 72
IV.FNVD.HHZ. 2021-08-29T13:28:37.38 0.6 positive manual P 288 49.1175 50 0.09 47
IV.ASQU.HHZ. 2021-08-29T13:28:37.67 0.6 undecidable manual S 166 26.751 105 0.28 47
IV.CRE.HHZ. 2021-08-29T13:28:36.83 0.3 positive manual P 157 49.7169 50 -0.55 63
IV.BRIS.HNZ. 2021-08-29T13:28:36.22 0.6 undecidable manual S 12 21.9669 108 0.44 46
IV.IMOL.EHZ. 2021-08-29T13:28:35.72 0.1 undecidable manual P 4 36.5412 101 0.48 88
IV.SFI.EHZ. 2021-08-29T13:28:34.70 0.6 undecidable manual S 142 17.871 112 0.26 48
IV.ASQU.HHZ. 2021-08-29T13:28:33.20 0.3 negative manual P 166 26.751 105 -0.13 72
IV.BOSL.HHZ. 2021-08-29T13:28:33.76 0.3 negative manual P 248 28.9488 104 0.01 74
IV.VISG.HHZ. 2021-08-29T13:28:33.25 0.6 undecidable manual P 309 28.0497 104 -0.32 46
IV.RUFI.EHZ. 2021-08-29T13:28:33.25 1.0 undecidable manual P 217 26.751 105 -0.07 24
IV.SEI.HHZ. 2021-08-29T13:28:33.34 0.6 undecidable manual P 275 28.0497 104 -0.24 47
IV.BRIS.HNZ. 2021-08-29T13:28:32.35 0.1 undecidable manual P 12 21.9669 108 -0.05 99
IV.SFI.EHZ. 2021-08-29T13:28:31.66 0.1 positive manual P 142 17.871 112 0.04 100
IV.LMD.HHZ. 2021-08-29T13:28:30.48 0.1 undecidable manual S 358 5.0949 144 -0.33 96
IV.LMD.HHZ. 2021-08-29T13:28:29.34 0.3 undecidable manual P 358 5.0949 144 -0.19 74
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SFI.HNE. ML:1.5 0.00028599999999999996 0.98 AML other m 2021-08-29T13:28:34.73
IV.SFI.EHE. ML:1.5 0.0002925 0.38 AML other m 2021-08-29T13:28:34.74
IV.SFI.HNN. ML:1.6 0.0003465 0.1 AML other m 2021-08-29T13:28:34.88
IV.SFI.EHN. ML:1.6 0.00035250000000000006 0.1 AML other m 2021-08-29T13:28:34.89
IV.ASQU.HHN. ML:1.8 0.0003845 0.2 AML other m 2021-08-29T13:28:37.76
IV.RUFI.EHN. ML:1.7 0.00029549999999999997 1.72 AML other m 2021-08-29T13:28:38.88
IV.RUFI.EHE. ML:1.2 0.0000927 0.4 AML other m 2021-08-29T13:28:38.26
IV.ASQU.HHE. ML:1.6 0.0002105 1.18 AML other m 2021-08-29T13:28:38.18
IV.BOSL.HHE. ML:0.9 0.000038350000000000004 0.8 AML other m 2021-08-29T13:28:38.90
IV.BOSL.HHN. ML:1.1 0.0000666 0.46 AML other m 2021-08-29T13:28:38.73
IV.VISG.HHN. ML:1.1 0.00006835 1.86 AML other m 2021-08-29T13:28:39.93
IV.VISG.HHE. ML:0.8 0.00003585 0.64 AML other m 2021-08-29T13:28:39.28
IV.SEI.HHN. ML:1.7 0.0002595 0.36 AML other m 2021-08-29T13:28:40.52
IV.SEI.HHE. ML:1.4 0.000148 1.42 AML other m 2021-08-29T13:28:44.99
IV.CRE.HHN. ML:1.5 0.00009224999999999999 0.62 AML other m 2021-08-29T13:28:44.53
IV.CRE.HHE. ML:1.4 0.0000657 0.58 AML other m 2021-08-29T13:28:45.62
IV.FNVD.HHE. ML:1.2 0.000042300000000000005 0.9 AML other m 2021-08-29T13:28:45.25
IV.FNVD.HHN. ML:1.3 0.0000519 1.02 AML other m 2021-08-29T13:28:46.69
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