Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.3 on date 30-09-2023 and time 10:29:01 (UTC) in region 2 km NW Portico e San Benedetto (FC)

A magnitude ML 0.3 earthquake occured in region: 2 km NW Portico e San Benedetto (FC), on

  • 30-09-2023 10:29:01 (UTC)
  • 30-09-2023 12:29:01 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0450, 11.7650 at 9 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 2 756 756
Tredozio FC 4 1212 1968
Rocca San Casciano FC 7 1910 3878
Premilcuore FC 8 799 4677
Marradi FI 13 3139 7816
Modigliana FC 13 4560 12376
Galeata FC 13 2516 14892
Dovadola FC 13 1653 16545
Civitella di Romagna FC 15 3786 20331
Santa Sofia FC 16 4136 24467
San Godenzo FI 18 1167 25634
Predappio FC 18 6346 31980
Palazzuolo sul Senio FI 19 1154 33134
Brisighella RA 20 7639 40773

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km SW of Faenza (58541 inhabitants)
30 Km SW of Forlì (117913 inhabitants)
35 Km S of Imola (69797 inhabitants)
40 Km W of Cesena (96758 inhabitants)
51 Km NE of Firenze (382808 inhabitants)
54 Km SW of Ravenna (159116 inhabitants)
56 Km E of Prato (191150 inhabitants)
57 Km NE of Scandicci (50609 inhabitants)
60 Km SE of Bologna (386663 inhabitants)
64 Km W of Rimini (147750 inhabitants)
65 Km N of Arezzo (99543 inhabitants)
69 Km E of Pistoia (90315 inhabitants)
88 Km NE of Siena (53903 inhabitants)
89 Km S of Ferrara (133155 inhabitants)
93 Km W of Pesaro (94582 inhabitants)
95 Km SE of Modena (184973 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 0.3 2023-09-30
10:29:01		 44.0448 11.7653 9 2023-09-30
10:34:17		 Sala Sismica INGV-Roma 121612861
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-30 10:29:01 ± 0.19
Latitude 44.0448 ± 0.0063
Longitude 11.7653 ± 0.0088
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121612861

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 654
Semi-minor axis of confidence ellipse (meter) 536
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 30
Circular confidence region, given by single value of horizontal uncertainty (meter) 650.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 209
Number of associated phases, regardless of their use for origin computation 9
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.05306
Epicentral distance of station farthest from the epicenter (degree) 0.27699
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

ML:0.3

Field Value
Value 0.3
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 121612861
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-30 10:34:17
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RINC.EHZ. 2023-09-30T10:29:09.26 0.6 undecidable manual S 216 21.6672 114 -0.06 98
IV.VMGN.HHZ. 2023-09-30T10:29:09.19 0.6 undecidable manual S 242 21.0678 114 0.04 98
IV.SFI.EHZ. 2023-09-30T10:29:07.60 0.6 undecidable manual S 157 16.872 119 -0.23 95
IV.RUFI.EHZ. 2023-09-30T10:29:07.31 0.6 positive manual P 222 30.747 50 -0.19 94
IV.SFI.EHZ. 2023-09-30T10:29:05.35 0.6 undecidable manual P 157 16.872 119 0.35 93
IV.VMGN.HHZ. 2023-09-30T10:29:05.90 0.6 positive manual P 242 21.0678 114 0.14 96
IV.RINC.EHZ. 2023-09-30T10:29:05.96 0.6 positive manual P 216 21.6672 114 0.1 97
IV.LMD.HHZ. 2023-09-30T10:29:04.91 0.6 undecidable manual S 308 5.8941 148 -0.08 100
IV.LMD.HHZ. 2023-09-30T10:29:03.24 1.0 undecidable manual P 308 5.8941 148 -0.12 50
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHE. ML:0.9 0.000129 1.84 AML other m 2023-09-30T10:29:04.03
IV.LMD.HHN. ML:0.9 0.000128 0.5 AML other m 2023-09-30T10:29:05.05
IV.SFI.EHE. ML:0.4 0.00001938375 0.1024 AML other m 2023-09-30T10:29:08.30
IV.SFI.EHN. ML:0.2 0.0000153747665 0.1984 AML other m 2023-09-30T10:29:08.32
IV.VMGN.HHE. ML:0.2 0.0000086955025 0.1408 AML other m 2023-09-30T10:29:09.16
IV.VMGN.HHN. ML:0.2 0.0000080153525 0.1408 AML other m 2023-09-30T10:29:09.11
IV.RINC.EHE. ML:0.2 0.000012382945499999999 0.1792 AML other m 2023-09-30T10:29:09.38
IV.RINC.EHN. ML:0.3 0.000017401690000000002 1.0368 AML other m 2023-09-30T10:29:15.86
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