Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 04-07-2020 and time 05:25:09 (Italy) in region 4 km S Casola Valsenio (RA)

A magnitude ML 1.6 earthquake occured in region: 4 km S Casola Valsenio (RA), on

  • 04-07-2020 03:25:09 (UTC)
  • 04-07-2020 05:25:09 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.1930, 11.6240 at 28 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Casola Valsenio RA 4 2617 2617
Fontanelice BO 9 1943 4560
Castel del Rio BO 10 1246 5806
Borgo Tossignano BO 10 3288 9094
Palazzuolo sul Senio FI 11 1154 10248
Casalfiumanese BO 12 3438 13686
Brisighella RA 12 7639 21325
Riolo Terme RA 12 5720 27045
Marradi FI 13 3139 30184
Modigliana FC 14 4560 34744
Tredozio FC 16 1212 35956
Dozza BO 19 6652 42608
Imola BO 19 69797 112405
Castel Bolognese RA 20 9554 121959

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km SW of Imola (69797 inhabitants)
23 Km W of Faenza (58541 inhabitants)
34 Km W of Forlì (117913 inhabitants)
40 Km SE of Bologna (386663 inhabitants)
50 Km W of Cesena (96758 inhabitants)
52 Km W of Ravenna (159116 inhabitants)
54 Km NE of Prato (191150 inhabitants)
55 Km NE of Firenze (382808 inhabitants)
60 Km NE of Scandicci (50609 inhabitants)
63 Km E of Pistoia (90315 inhabitants)
72 Km S of Ferrara (133155 inhabitants)
75 Km SE of Modena (184973 inhabitants)
77 Km W of Rimini (147750 inhabitants)
83 Km N of Arezzo (99543 inhabitants)
88 Km SE of Carpi (70699 inhabitants)
97 Km SE of Reggio nell'Emilia (171345 inhabitants)
98 Km E of Lucca (89046 inhabitants)
99 Km S of Rovigo (51867 inhabitants)
100 Km N of Siena (53903 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
Bulletin
Rev1000 		ML 1.6 2020-07-04
03:25:09		 44.1928 11.6238 28 2020-11-19
12:36:55		 Bollettino Sismico Italiano INGV 81643461
Reviewed
Rev100 		ML 1.8 2020-07-04
03:25:09		 44.1967 11.6285 29 2020-07-04
03:31:04		 Sala Sismica INGV-Roma 80755991
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-07-04 03:25:09 ± 0.34
Latitude 44.1928 ± 0.0108
Longitude 11.6238 ± 0.0163
Depth (km) 28 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 81643461

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1228
Semi-minor axis of confidence ellipse (meter) 760
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 281
Circular confidence region, given by single value of horizontal uncertainty (meter) 1230.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 111
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 19
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.10702
Epicentral distance of station farthest from the epicenter (degree) 0.36423
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 81643461
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-10-06 14:52:58

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 80755991
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-07-04 03:31:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RUFI.EHZ. 2020-07-04T03:25:24.11 0.3 undecidable manual S 193 40.4262 119 0.22 72
IV.SFI.EHZ. 2020-07-04T03:25:23.17 0.3 undecidable manual S 151 36.5412 122 0.16 72
IV.RINC.HHN. 2020-07-04T03:25:22.69 0.3 undecidable manual S 182 34.0437 124 0.25 72
IV.SEI.HHZ. 2020-07-04T03:25:21.10 0.3 undecidable manual S 234 26.1516 132 0.32 73
IV.RONT.HHZ. 2020-07-04T03:25:21.47 0.3 undecidable manual S 215 26.8509 131 0.55 69
IV.MTRZ.HNZ. 2020-07-04T03:25:20.32 0.6 undecidable manual S 310 20.6682 140 0.56 47
IV.LMD.HHZ. 2020-07-04T03:25:18.22 0.3 undecidable manual S 153 14.4744 150 -0.57 69
IV.VISG.HHZ. 2020-07-04T03:25:18.35 0.3 undecidable manual S 268 15.0738 149 -0.53 67
IV.BRIS.HHZ. 2020-07-04T03:25:18.83 0.3 undecidable manual S 73 11.877 155 0.35 72
IV.SFI.EHZ. 2020-07-04T03:25:17.13 0.3 undecidable manual P 151 36.5412 122 -0.15 74
IV.RUFI.EHZ. 2020-07-04T03:25:17.68 0.1 positive manual P 193 40.4262 119 -0.11 97
IV.RONT.HHZ. 2020-07-04T03:25:16.04 0.3 undecidable manual P 215 26.8509 131 -0.03 76
IV.RINC.HHN. 2020-07-04T03:25:16.87 0.3 undecidable manual P 182 34.0437 124 -0.08 74
IT.FAZ.HNZ. 2020-07-04T03:25:16.72 0.1 undecidable manual P 61 24.1536 135 0.95 76
IV.MTRZ.HNZ. 2020-07-04T03:25:15.74 0.3 undecidable manual P 310 20.6682 140 0.34 73
IV.SEI.HHZ. 2020-07-04T03:25:15.92 0.1 undecidable manual P 234 26.1516 132 -0.07 100
IV.VISG.HHZ. 2020-07-04T03:25:14.31 0.1 positive manual P 268 15.0738 149 -0.59 89
IV.BRIS.HHZ. 2020-07-04T03:25:14.41 0.1 positive manual P 73 11.877 155 -0.25 100
IV.LMD.HHZ. 2020-07-04T03:25:14.22 0.1 undecidable manual P 153 14.4744 150 -0.62 90
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHE. ML:2.0 0.00049415595 0.2592 AML other m 2020-07-04T03:25:18.39
IV.VISG.HHE. ML:1.4 0.00011431903 0.16 AML other m 2020-07-04T03:25:18.61
IV.LMD.HHN. ML:2.0 0.00048232969999999995 0.2 AML other m 2020-07-04T03:25:18.53
IV.VISG.HHN. ML:1.5 0.00014903285 0.12 AML other m 2020-07-04T03:25:18.69
IV.BRIS.HHE. ML:2.0 0.00048669169999999995 0.1808 AML other m 2020-07-04T03:25:18.92
IV.BRIS.HHN. ML:1.9 0.0004278634 0.32 AML other m 2020-07-04T03:25:19.17
IV.RONT.HHE. ML:2.0 0.00039515075 0.32 AML other m 2020-07-04T03:25:21.72
IV.RONT.HHN. ML:1.8 0.00025452955 0.24 AML other m 2020-07-04T03:25:22.42
IV.SFI.EHE. ML:1.3 0.00006733498 0.24 AML other m 2020-07-04T03:25:23.31
IV.BRIS.HNE. ML:1.4 0.00013003426 0.72 AML other m 2020-07-04T03:25:23.44
IV.SFI.EHN. ML:1.4 0.00007044118 0.3792 AML other m 2020-07-04T03:25:23.59
IV.BRIS.HNN. ML:1.5 0.00016562475 1.2192 AML other m 2020-07-04T03:25:27.19
IV.SFI.HNN. ML:1.6 0.0001302103 1.2592 AML other m 2020-07-04T03:25:27.02
IV.SFI.HNE. ML:1.5 0.00009882039499999999 0.6 AML other m 2020-07-04T03:25:28.03
IV.RUFI.EHN. ML:1.1 0.000034025113 1.7216 AML other m 2020-07-04T03:25:31.46
IV.RUFI.EHE. ML:1.0 0.000030587995 1.6608 AML other m 2020-07-04T03:25:33.58
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