Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.4 on date 30-10-2019 and time 03:13:31 (Italy) in region 6 km NE Marradi (FI)

A magnitude ML 0.4 earthquake occured in region: 6 km NE Marradi (FI), on

  • 30-10-2019 02:13:31 (UTC)
  • 30-10-2019 03:13:31 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.1280, 11.6360 at 8 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
Marradi FI 6 3139 3139
Palazzuolo sul Senio FI 7 1154 4293
Tredozio FC 10 1212 5505
Casola Valsenio RA 11 2617 8122
Modigliana FC 13 4560 12682
Castel del Rio BO 14 1246 13928
Brisighella RA 15 7639 21567
Fontanelice BO 16 1943 23510
Portico e San Benedetto FC 16 756 24266
Borgo Tossignano BO 17 3288 27554
Riolo Terme RA 18 5720 33274
Rocca San Casciano FC 18 1910 35184
Casalfiumanese BO 19 3438 38622

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km S of Imola (69797 inhabitants)
27 Km SW of Faenza (58541 inhabitants)
34 Km W of Forlì (117913 inhabitants)
47 Km SE of Bologna (386663 inhabitants)
49 Km W of Cesena (96758 inhabitants)
50 Km NE of Firenze (382808 inhabitants)
51 Km NE of Prato (191150 inhabitants)
55 Km NE of Scandicci (50609 inhabitants)
55 Km SW of Ravenna (159116 inhabitants)
61 Km E of Pistoia (90315 inhabitants)
75 Km W of Rimini (147750 inhabitants)
76 Km N of Arezzo (99543 inhabitants)
79 Km S of Ferrara (133155 inhabitants)
81 Km SE of Modena (184973 inhabitants)
93 Km N of Siena (53903 inhabitants)
94 Km SE of Carpi (70699 inhabitants)
96 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 0.4 2019-10-30
02:13:31		 44.1275 11.6357 8 2019-10-30
02:21:46		 Sala Sismica INGV-Roma 73527481
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-10-30 02:13:31 ± 0.1
Latitude 44.1275 ± 0.0045
Longitude 11.6357 ± 0.0063
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 73527481

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 505
Semi-minor axis of confidence ellipse (meter) 287
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 125
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) 154
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.34894
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 5
Magnitude information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.0
Num. used stations 2
Type of magnitude ML
Reference to an origin 73527481
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-10-30 02:21:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ASQU.HHZ. 2019-10-30T02:13:45.29 0.6 undecidable manual S 161 38.7279 50 0.25 45
IV.MURB.HHZ. 2019-10-30T02:13:43.95 3.0 positive manual P -0.01 0
IV.SFI.EHZ. 2019-10-30T02:13:42.24 0.6 undecidable manual S 146 29.9478 105 -0.05 48
IV.SEI.HHZ. 2019-10-30T02:13:40.34 0.6 undecidable manual S 250 23.5542 109 0.18 47
IV.ASQU.HHZ. 2019-10-30T02:13:39.38 0.6 undecidable manual P 161 38.7279 50 0.04 47
IV.BRIS.HHZ. 2019-10-30T02:13:37.57 0.3 undecidable manual S 44 14.9739 118 0.14 72
IV.SFI.EHZ. 2019-10-30T02:13:37.37 0.3 undecidable manual P 146 29.9478 105 -0.38 67
IV.SEI.HHZ. 2019-10-30T02:13:36.41 0.3 undecidable manual P 250 23.5542 109 -0.11 72
IV.LMD.HHZ. 2019-10-30T02:13:35.62 0.3 undecidable manual S 134 7.9809 135 0.18 72
IV.BRIS.HHZ. 2019-10-30T02:13:34.85 0.1 positive manual P 44 14.9739 118 -0.09 97
IV.LMD.HHZ. 2019-10-30T02:13:33.79 0.1 undecidable manual P 134 7.9809 135 -0.01 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHE. ML:0.4 0.0000427 0.28 AML other m 2019-10-30T02:13:35.70
IV.LMD.HHN. ML:0.4 0.000040300000000000004 0.44 AML other m 2019-10-30T02:13:37.46
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