Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 21-07-2020 and time 05:04:38 (Italy) in region 6 km N Marradi (FI)

A magnitude ML 1.9 earthquake occured in region: 6 km N Marradi (FI), on

  • 21-07-2020 03:04:38 (UTC)
  • 21-07-2020 05:04:38 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.1260, 11.6240 at 9 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
Marradi FI 6 3139 3139
Palazzuolo sul Senio FI 6 1154 4293
Tredozio FC 11 1212 5505
Casola Valsenio RA 11 2617 8122
Castel del Rio BO 14 1246 9368
Modigliana FC 14 4560 13928
Fontanelice BO 16 1943 15871
Brisighella RA 16 7639 23510
Portico e San Benedetto FC 17 756 24266
Borgo Tossignano BO 17 3288 27554
Riolo Terme RA 19 5720 33274
Rocca San Casciano FC 19 1910 35184
Casalfiumanese BO 19 3438 38622
Firenzuola FI 20 4726 43348

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km S of Imola (69797 inhabitants)
27 Km SW of Faenza (58541 inhabitants)
35 Km W of Forlì (117913 inhabitants)
47 Km SE of Bologna (386663 inhabitants)
49 Km NE of Firenze (382808 inhabitants)
49 Km W of Cesena (96758 inhabitants)
50 Km NE of Prato (191150 inhabitants)
54 Km NE of Scandicci (50609 inhabitants)
56 Km SW of Ravenna (159116 inhabitants)
60 Km E of Pistoia (90315 inhabitants)
76 Km W of Rimini (147750 inhabitants)
76 Km N of Arezzo (99543 inhabitants)
79 Km S of Ferrara (133155 inhabitants)
80 Km SE of Modena (184973 inhabitants)
93 Km N of Siena (53903 inhabitants)
94 Km SE of Carpi (70699 inhabitants)
95 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
Bulletin
Rev1000 		ML 1.9 2020-07-21
03:04:38		 44.1255 11.6242 9 2020-11-19
12:36:59		 Bollettino Sismico Italiano INGV 82534371
Reviewed
Rev100 		ML 2.0 2020-07-21
03:04:38		 44.1258 11.6298 9 2020-07-21
03:10:20		 Sala Sismica INGV-Roma 81206741
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-07-21 03:04:38 ± 0.08
Latitude 44.1255 ± 0.0045
Longitude 11.6242 ± 0.0063
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 82534371

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 481
Semi-minor axis of confidence ellipse (meter) 286
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 318
Circular confidence region, given by single value of horizontal uncertainty (meter) 480.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 65
Number of associated phases, regardless of their use for origin computation 34
Number of defining phases 34
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.35
Epicentral distance of station closest to the epicenter (degree) 0.07644
Epicentral distance of station farthest from the epicenter (degree) 0.88763
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 22
Magnitudes information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 48
Type of magnitude ML
Reference to an origin 82534371
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-09-01 15:30:26

ML:2.0

Field Value
Value 2.0
Uncertainty 0.3
Num. used stations 44
Type of magnitude ML
Reference to an origin 81206741
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-07-21 03:10:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PII.HHZ. 2020-07-21T03:04:56.11 0.3 undecidable manual P 243 98.5236 50 0.75 53
IV.FNVD.HHZ. 2020-07-21T03:04:52.30 0.3 undecidable manual S 277 40.1265 50 0.17 70
IV.CSNT.HHZ. 2020-07-21T03:04:52.69 0.6 undecidable manual P 200 77.1672 50 0.63 38
IV.BDI.HHZ. 2020-07-21T03:04:52.63 0.3 undecidable manual P 266 82.251 50 -0.22 64
GU.POPM.HHZ. 2020-07-21T03:04:50.81 0.3 undecidable manual P 263 69.6747 50 -0.1 67
IV.RUFI.EHZ. 2020-07-21T03:04:50.40 0.3 undecidable manual S 196 33.1446 50 0.13 71
IV.SFI.EHZ. 2020-07-21T03:04:49.60 0.3 undecidable manual S 144 30.2475 106 0.16 71
IV.MTRZ.HHZ. 2020-07-21T03:04:49.00 0.6 undecidable manual S 323 26.1516 109 0.93 37
IV.CRE.HHZ. 2020-07-21T03:04:49.68 0.3 undecidable manual P 155 61.9935 50 -0.05 68
IT.FAZ.HNZ. 2020-07-21T03:04:49.40 0.3 undecidable manual S 48 28.5492 107 0.53 65
IV.IMOL.EHZ. 2020-07-21T03:04:49.40 0.3 undecidable manual S 20 27.6501 108 0.84 58
IV.ZCCA.HHZ. 2020-07-21T03:04:49.48 0.3 undecidable manual P 296 57.1983 50 0.49 63
IV.CMPO.HNN. 2020-07-21T03:04:48.92 0.6 undecidable manual P 16 52.503 50 0.65 40
IV.RINC.HHZ. 2020-07-21T03:04:48.50 0.3 undecidable manual S 183 26.5512 109 0.29 69
IV.RONT.HHZ. 2020-07-21T03:04:47.10 0.3 undecidable manual S 226 21.1677 113 0.65 63
IV.SEI.HHZ. 2020-07-21T03:04:47.20 0.3 undecidable manual S 250 22.5552 112 0.29 70
IV.MPPT.EHZ. 2020-07-21T03:04:47.02 0.1 undecidable manual P 247 46.4202 50 -0.32 89
IV.BRSN.EHZ. 2020-07-21T03:04:46.84 0.6 negative manual P 64 40.3263 50 0.45 44
IV.RUFI.EHZ. 2020-07-21T03:04:45.02 0.1 undecidable manual P 196 33.1446 50 -0.27 92
IV.ASQU.HHZ. 2020-07-21T03:04:45.89 0.1 undecidable manual P 160 38.8278 50 -0.26 91
IV.FNVD.HHZ. 2020-07-21T03:04:45.74 0.1 undecidable manual P 277 40.1265 50 -0.62 82
IV.IMOL.EHZ. 2020-07-21T03:04:44.10 0.3 undecidable manual P 20 27.6501 108 -0.2 71
IV.BRIS.HHZ. 2020-07-21T03:04:44.40 0.3 undecidable manual S 46 15.7731 120 -0.38 69
IV.RINC.HHZ. 2020-07-21T03:04:44.05 0.1 undecidable manual P 183 26.5512 109 -0.05 97
IT.FAZ.HNZ. 2020-07-21T03:04:44.40 0.3 undecidable manual P 48 28.5492 107 -0.08 72
IV.SFI.EHZ. 2020-07-21T03:04:44.45 0.1 undecidable manual P 144 30.2475 106 -0.36 91
IV.VISG.HHZ. 2020-07-21T03:04:44.60 0.3 undecidable manual S 295 16.6722 118 -0.45 68
IV.LMD.HHZ. 2020-07-21T03:04:43.00 0.6 undecidable manual S 129 8.4804 136 0.23 48
IV.RONT.HHZ. 2020-07-21T03:04:43.20 0.1 undecidable manual P 226 21.1677 113 0.12 97
IV.MTRZ.HHZ. 2020-07-21T03:04:43.90 0.3 undecidable manual P 323 26.1516 109 -0.12 72
IV.SEI.HHZ. 2020-07-21T03:04:43.14 0.1 undecidable manual P 250 22.5552 112 -0.21 95
IV.VISG.HHZ. 2020-07-21T03:04:41.78 0.1 undecidable manual P 295 16.6722 118 -0.49 90
IV.BRIS.HHZ. 2020-07-21T03:04:41.58 0.1 undecidable manual P 46 15.7731 120 -0.54 89
IV.LMD.HHZ. 2020-07-21T03:04:40.89 0.1 undecidable manual P 129 8.4804 136 -0.07 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BRIS.HHN. ML:0.0 0.0029311859999999997 0.1792 AML other m 2020-07-21T03:04:44.83
IV.BRIS.HHE. ML:0.0 0.0027597815 0.0992 AML other m 2020-07-21T03:04:44.80
IV.LMD.HHE. ML:1.9 0.0012436565000000003 0.3408 AML other m 2020-07-21T03:04:45.77
IV.LMD.HHN. ML:2.0 0.00155101 0.36 AML other m 2020-07-21T03:04:45.76
IV.VISG.HHN. ML:2.3 0.001945965 0.12 AML other m 2020-07-21T03:04:45.04
IV.VISG.HHE. ML:2.2 0.001636942 0.1392 AML other m 2020-07-21T03:04:44.98
IV.SEI.HHN. ML:2.6 0.0025782225 0.3392 AML other m 2020-07-21T03:04:47.63
IV.SEI.HHE. ML:2.4 0.0015395285 0.2592 AML other m 2020-07-21T03:04:47.51
IV.RONT.HHN. ML:2.4 0.0016210789999999999 0.3008 AML other m 2020-07-21T03:04:48.94
IV.RONT.HHE. ML:2.2 0.001204002 0.24 AML other m 2020-07-21T03:04:48.40
IV.MTRZ.HNE. ML:2.2 0.0008684761999999999 0.24 AML other m 2020-07-21T03:04:50.84
IV.MTRZ.HHE. ML:2.2 0.00094203865 0.24 AML other m 2020-07-21T03:04:50.84
IV.MTRZ.HNN. ML:2.2 0.00102416875 0.3408 AML other m 2020-07-21T03:04:50.78
IV.MTRZ.HHN. ML:2.3 0.0011306434 0.3392 AML other m 2020-07-21T03:04:50.78
IV.RINC.HHN. ML:1.8 0.0003283847 0.2992 AML other m 2020-07-21T03:04:49.71
IV.RINC.HHE. ML:1.9 0.0004458332 0.32 AML other m 2020-07-21T03:04:50.67
IV.IMOL.HNE. ML:2.6 0.0021453915 0.1488 AML other m 2020-07-21T03:04:50.11
IV.IMOL.HNN. ML:2.5 0.001564052 0.2 AML other m 2020-07-21T03:04:50.03
IV.SFI.EHE. ML:1.7 0.00023362169999999999 0.3392 AML other m 2020-07-21T03:04:53.92
IV.SFI.HNE. ML:1.6 0.00021547935 0.3392 AML other m 2020-07-21T03:04:53.91
IV.SFI.EHN. ML:1.7 0.00024812704999999997 0.6208 AML other m 2020-07-21T03:04:55.87
IV.SFI.HNN. ML:1.8 0.0003315633 0.6288 AML other m 2020-07-21T03:04:55.86
IV.RUFI.EHN. ML:1.5 0.000123231505 0.4208 AML other m 2020-07-21T03:04:53.39
IV.RUFI.EHE. ML:1.6 0.000196629 0.28 AML other m 2020-07-21T03:04:50.90
IV.FNVD.HHN. ML:2.0 0.00034461605 0.1792 AML other m 2020-07-21T03:04:54.41
IV.FNVD.HHE. ML:2.0 0.00035778149999999995 0.3008 AML other m 2020-07-21T03:04:52.57
IV.ASQU.HHE. ML:1.7 0.0001717361 0.24 AML other m 2020-07-21T03:04:52.20
IV.ASQU.HHN. ML:1.7 0.00019726569999999998 0.3616 AML other m 2020-07-21T03:04:56.15
IV.BRSN.HNE. ML:2.3 0.0007598951 0.2992 AML other m 2020-07-21T03:04:55.12
IV.BRSN.HNN. ML:2.2 0.0005695139499999999 0.1392 AML other m 2020-07-21T03:04:55.53
IV.BRSN.EHN. ML:2.2 0.0005710819000000001 0.1392 AML other m 2020-07-21T03:04:55.53
IV.BRSN.EHE. ML:2.3 0.0007296163 0.2208 AML other m 2020-07-21T03:04:56.32
IV.MPPT.EHN. ML:1.4 0.00007319302999999999 0.68 AML other m 2020-07-21T03:05:01.86
IV.MPPT.EHE. ML:1.4 0.00007595818 0.7184 AML other m 2020-07-21T03:04:58.76
IV.CRE.HHE. ML:1.5 0.000060991234999999995 0.2592 AML other m 2020-07-21T03:05:03.48
IV.CRE.HHN. ML:1.8 0.00012331775 0.32 AML other m 2020-07-21T03:05:00.37
IV.ZCCA.HHE. ML:1.3 0.000045477655000000004 0.84 AML other m 2020-07-21T03:05:08.15
IV.ZCCA.HNE. ML:1.7 0.000102019705 0.6912 AML other m 2020-07-21T03:05:16.29
IV.ZCCA.HHN. ML:1.3 0.00004518787 0.6608 AML other m 2020-07-21T03:05:14.73
GU.POPM.HHE. ML:1.8 0.000093052595 0.2208 AML other m 2020-07-21T03:05:04.10
GU.POPM.HHN. ML:1.7 0.00008911524500000001 0.28 AML other m 2020-07-21T03:05:03.41
IV.BDI.HNE. ML:1.9 0.000101350335 0.48 AML other m 2020-07-21T03:05:08.47
IV.BDI.HHN. ML:1.5 0.00004640589000000001 0.5792 AML other m 2020-07-21T03:05:10.45
IV.BDI.HHE. ML:1.7 0.000072465235 0.76 AML other m 2020-07-21T03:05:08.43
IV.CSNT.HHE. ML:1.7 0.00006897441 0.44 AML other m 2020-07-21T03:05:06.50
IV.CSNT.HHN. ML:1.6 0.00006409361 0.68 AML other m 2020-07-21T03:05:06.52
IV.PII.HHE. ML:1.7 0.000048229225 0.3008 AML other m 2020-07-21T03:05:12.84
IV.PII.HHN. ML:1.7 0.0000478564 0.28 AML other m 2020-07-21T03:05:11.11
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
Waveforms Seismic signals in miniseed + resp format Download