Earthquake with magnitude of ML 0.5 on date 21-09-2023 and time 10:55:53 (UTC) in region 3 km NE Marradi (FI)

A magnitude ML 0.5 earthquake occured in region: 3 km NE Marradi (FI), on

  • 21-09-2023 10:55:53 (UTC)
  • 21-09-2023 12:55:53 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0930, 11.6480 at 6 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Marradi FI 3 3139 3139
Tredozio FC 8 1212 4351
Palazzuolo sul Senio FI 8 1154 5505
Portico e San Benedetto FC 13 756 6261
Modigliana FC 14 4560 10821
Casola Valsenio RA 15 2617 13438
Rocca San Casciano FC 16 1910 15348
Premilcuore FC 17 799 16147
Brisighella RA 17 7639 23786
Castel del Rio BO 18 1246 25032
San Godenzo FI 19 1167 26199
Dovadola FC 20 1653 27852
Fontanelice BO 20 1943 29795

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km SW of Faenza (58541 inhabitants)
30 Km S of Imola (69797 inhabitants)
35 Km W of Forlì (117913 inhabitants)
48 Km W of Cesena (96758 inhabitants)
48 Km NE of Firenze (382808 inhabitants)
50 Km E of Prato (191150 inhabitants)
51 Km SE of Bologna (386663 inhabitants)
53 Km NE of Scandicci (50609 inhabitants)
57 Km SW of Ravenna (159116 inhabitants)
61 Km E of Pistoia (90315 inhabitants)
72 Km N of Arezzo (99543 inhabitants)
73 Km W of Rimini (147750 inhabitants)
83 Km S of Ferrara (133155 inhabitants)
84 Km SE of Modena (184973 inhabitants)
90 Km N of Siena (53903 inhabitants)
96 Km E of Lucca (89046 inhabitants)
98 Km SE of Carpi (70699 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 0.5 2023-09-21
10:55:53
44.0933 11.6482 7 2023-09-21
11:07:08
Sala Sismica INGV-Roma 121310651
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-21 10:55:53 ± 0.13
Latitude 44.0933 ± 0.0045
Longitude 11.6482 ± 0.0050
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 121310651

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 507
Semi-minor axis of confidence ellipse (meter) 97
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 214
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) 169
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.23652
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.5

Field Value
Value 0.5
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 121310651
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-21 11:07:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MCRV.HHZ. 2023-09-21T10:57:44.42 3.0 undecidable manual Sn 2.69 0
IV.SNAL.HNZ. 2023-09-21T10:57:44.38 3.0 undecidable manual Sn 5.09 0
IV.CAPA.HHZ. 2023-09-21T10:57:41.04 3.0 undecidable manual Sn -0.92 0
OE.WTTA.HHZ. 2023-09-21T10:57:13.03 3.0 undecidable manual Sn -2.09 0
GU.MGRO.HHZ. 2023-09-21T10:57:12.58 3.0 undecidable manual Sn 0.37 0
IV.SLCN.HHZ. 2023-09-21T10:57:04.28 3.0 positive manual Pn 4.37 0
IV.CAPA.HHZ. 2023-09-21T10:56:52.59 3.0 negative manual Pn -0.26 0
IV.BAG8.EHZ. 2023-09-21T10:56:45.71 3.0 undecidable manual Sn -1.28 0
GU.MGRO.HHZ. 2023-09-21T10:56:41.38 3.0 undecidable manual Pn 5.24 0
IV.GIUL.HHZ. 2023-09-21T10:56:39.61 3.0 negative manual Pg 5.58 0
IV.ARVD.HHZ. 2023-09-21T10:56:23.93 3.0 undecidable manual S -0.72 0
IV.FRON.EHZ. 2023-09-21T10:56:22.73 3.0 undecidable manual S 1.44 0
NI.POLC.HHZ. 2023-09-21T10:56:21.75 3.0 positive manual Pn 0.41 0
IV.ATFO.HHZ. 2023-09-21T10:56:09.37 3.0 undecidable manual P 0.84 0
IV.SFI.HNE. 2023-09-21T10:56:02.83 0.6 undecidable manual S 143 26.2515 104 0.16 47
IV.SEI.HHZ. 2023-09-21T10:56:01.51 0.6 undecidable manual S 259 23.4543 105 -0.23 47
IV.RINC.EHZ. 2023-09-21T10:56:01.83 0.6 undecidable manual S 188 23.1546 106 0.19 47
IV.VMGN.HHZ. 2023-09-21T10:56:00.14 0.6 undecidable manual S 211 17.9709 110 0.23 47
IV.VISG.HHZ. 2023-09-21T10:56:00.77 0.6 undecidable manual S 302 20.0688 108 0.17 48
IV.RINC.EHZ. 2023-09-21T10:55:58.20 1.0 negative manual P 188 23.1546 106 0.09 24
IV.SFI.HNE. 2023-09-21T10:55:58.40 0.1 undecidable manual P 143 26.2515 104 -0.31 92
IV.SEI.HHZ. 2023-09-21T10:55:58.01 0.6 negative manual P 259 23.4543 105 -0.16 47
IV.VISG.HHZ. 2023-09-21T10:55:57.63 0.1 undecidable manual P 302 20.0688 108 0.12 96
IV.VMGN.HHZ. 2023-09-21T10:55:57.24 0.6 positive manual P 211 17.9709 110 0.13 48
IV.LMD.HHZ. 2023-09-21T10:55:56.24 0.6 undecidable manual S 111 4.995 142 0.1 50
IV.LMD.HHZ. 2023-09-21T10:55:55.02 0.6 positive manual P 111 4.995 142 0.09 50
IT.MRR.HGZ. 2023-09-21T10:55:55.87 0.6 undecidable manual S 228 4.7952 143 -0.23 48
IT.MRR.HGZ. 2023-09-21T10:55:54.85 0.1 undecidable manual P 228 4.7952 143 -0.06 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHN. ML:0.0 0.00008389623 0.1216 AML other m 2023-09-21T10:55:56.91
IV.SEI.HHE. ML:0.7 0.000036613674999999996 0.1984 AML other m 2023-09-21T10:56:02.08
IV.SEI.HHN. ML:1.0 0.00007719999999999999 0.26 AML other m 2023-09-21T10:56:02.14
IV.VMGN.HHE. ML:0.2 0.000013230534999999999 0.1216 AML other m 2023-09-21T10:56:00.66
IV.VMGN.HHN. ML:0.2 0.000017175485 0.4032 AML other m 2023-09-21T10:56:00.65
IV.RINC.EHE. ML:0.5 0.0000223631665 0.5824 AML other m 2023-09-21T10:56:02.64
IV.RINC.EHN. ML:0.5 0.000021264959999999998 0.576 AML other m 2023-09-21T10:56:02.36
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