Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 31-07-2023 and time 03:57:25 (UTC) in region 6 km E Forlimpopoli (FC)

A magnitude ML 1.4 earthquake occured in region: 6 km E Forlimpopoli (FC), on

  • 31-07-2023 03:57:25 (UTC)
  • 31-07-2023 05:57:25 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.1980, 12.2020 at 10 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
Forlimpopoli FC 6 13290 13290
Cesena FC 7 96758 110048
Bertinoro FC 8 11059 121107
Forlì FC 13 117913 239020
Meldola FC 14 9970 248990
Cervia RA 14 28940 277930
Gambettola FC 14 10660 288590
Montiano FC 15 1716 290306
Cesenatico FC 16 25796 316102
Longiano FC 17 7126 323228
Gatteo FC 18 9068 332296
Roncofreddo FC 20 3386 335682
Savignano sul Rubicone FC 20 17766 353448
San Mauro Pascoli FC 20 11690 365138

Municipalities with at least 50000 inhabitants

An earthquake occurred to
7 Km NW of Cesena (96758 inhabitants)
13 Km E of Forlì (117913 inhabitants)
25 Km S of Ravenna (159116 inhabitants)
27 Km E of Faenza (58541 inhabitants)
33 Km W of Rimini (147750 inhabitants)
43 Km E of Imola (69797 inhabitants)
65 Km W of Pesaro (94582 inhabitants)
76 Km E of Bologna (386663 inhabitants)
76 Km NW of Fano (60888 inhabitants)
85 Km SE of Ferrara (133155 inhabitants)
85 Km NE of Arezzo (99543 inhabitants)
89 Km NE of Firenze (382808 inhabitants)
95 Km E of Prato (191150 inhabitants)
95 Km NE of Scandicci (50609 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 2023-07-31
03:57:25		 44.1977 12.2022 10 2023-07-31
04:20:32		 Sala Sismica INGV-Roma 119721201
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-07-31 03:57:25 ± 0.47
Latitude 44.1977 ± 0.0297
Longitude 12.2022 ± 0.0176
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 119721201

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 3420
Semi-minor axis of confidence ellipse (meter) 1080
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 15
Circular confidence region, given by single value of horizontal uncertainty (meter) 3420.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 248
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.77701
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 10
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 119721201
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-07-31 04:20:32
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.POPM.HHZ. 2023-07-31T03:57:57.71 3.0 undecidable manual Sn 0.22 0
IV.ZOVE.EHZ. 2023-07-31T03:57:50.28 3.0 positive manual Pn 0.8 0
IV.CSP1.EHZ. 2023-07-31T03:57:50.65 3.0 undecidable manual Pg 3.32 0
IV.PIEI.HHZ. 2023-07-31T03:57:49.02 0.6 undecidable manual S 160 78.0663 50 0.25 67
IV.SEI.HHZ. 2023-07-31T03:57:47.11 0.6 undecidable manual S 257 69.0753 50 0.77 58
IV.RINC.EHZ. 2023-07-31T03:57:43.67 0.6 undecidable manual S 234 58.6968 50 0.09 72
IV.FRON.EHZ. 2023-07-31T03:57:40.01 1.0 negative manual P 151 86.247 50 -0.06 34
IV.PIEI.HHZ. 2023-07-31T03:57:38.27 0.6 negative manual P 160 78.0663 50 -0.54 63
IV.MPAG.EHZ. 2023-07-31T03:57:38.76 1.0 undecidable manual P 145 77.1672 50 0.09 35
IV.SEI.HHZ. 2023-07-31T03:57:37.55 0.6 positive manual P 257 69.0753 50 0.14 70
IV.NARO.HHZ. 2023-07-31T03:57:37.43 0.6 undecidable manual P 155 71.7726 50 -0.41 66
IV.RUFI.EHZ. 2023-07-31T03:57:36.96 0.6 positive manual P 234 68.1762 50 -0.32 68
IV.RINC.EHZ. 2023-07-31T03:57:35.62 0.6 positive manual P 234 58.6968 50 -0.2 70
IV.CPGN.EHZ. 2023-07-31T03:57:33.98 0.6 positive manual P 168 45.0216 50 0.27 71
IV.RSM2.HHE. 2023-07-31T03:57:32.72 0.3 undecidable manual P 146 34.743 50 0.59 100
IV.SFI.EHE. 2023-07-31T03:57:32.80 0.3 undecidable manual P 221 43.1235 50 -0.62 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CPGN.EHN. ML:1.8 0.0001678 0.58 AML other m 2023-07-31T03:57:42.61
IV.CPGN.EHE. ML:1.4 0.0000734 0.82 AML other m 2023-07-31T03:57:42.39
IV.NARO.HHE. ML:1.1 0.0000213 0.48 AML other m 2023-07-31T03:57:48.39
IV.SEI.HHE. ML:1.2 0.00003175 0.56 AML other m 2023-07-31T03:57:49.55
IV.PIEI.HHE. ML:1.5 0.000050549999999999995 0.38 AML other m 2023-07-31T03:57:49.92
IV.PIEI.HHN. ML:1.4 0.00004105 0.36 AML other m 2023-07-31T03:57:49.98
IV.NARO.HHN. ML:1.0 0.0000173 0.56 AML other m 2023-07-31T03:57:55.45
IV.SEI.HHN. ML:1.6 0.00005955 1.22 AML other m 2023-07-31T03:57:58.11
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