Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 04-02-2021 and time 13:36:44 (Italy) in region 3 km E Massa Martana (PG)

A magnitude ML 2.0 earthquake occured in region: 3 km E Massa Martana (PG), on

  • 04-02-2021 12:36:44 (UTC)
  • 04-02-2021 13:36:44 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7880, 12.5630 at 8 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
Massa Martana PG 3 3770 3770
Giano dell'Umbria PG 5 3846 7616
Castel Ritaldi PG 10 3278 10894
Acquasparta TR 11 4778 15672
Todi PG 13 16851 32523
Gualdo Cattaneo PG 14 6155 38678
Montefalco PG 14 5679 44357
Spoleto PG 16 38218 82575
Collazzone PG 16 3473 86048
Montecastrilli TR 16 5022 91070
Bevagna PG 17 5081 96151
Fratta Todina PG 18 1839 97990
Campello sul Clitunno PG 18 2442 100432
Monte Castello di Vibio PG 18 1567 101999
Trevi PG 18 8469 110468
Avigliano Umbro TR 18 2558 113026
San Gemini TR 19 5018 118044

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km SW of Foligno (57155 inhabitants)
26 Km N of Terni (111501 inhabitants)
38 Km SE of Perugia (166134 inhabitants)
56 Km NE of Viterbo (67173 inhabitants)
84 Km NW of L'Aquila (69753 inhabitants)
89 Km N of Guidonia Montecelio (88673 inhabitants)
94 Km SE of Arezzo (99543 inhabitants)
94 Km N of Tivoli (56533 inhabitants)
94 Km W of Teramo (54892 inhabitants)
100 Km N of Roma (2864731 inhabitants)
100 Km NE of Civitavecchia (52991 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 2.0 2021-02-04
12:36:44		 42.7877 12.5627 8 2021-07-12
16:55:00		 Bollettino Sismico Italiano INGV 87774391
Reviewed
Rev100 		ML 2.1 2021-02-04
12:36:44		 42.785 12.552 9 2021-02-04
12:48:31		 Sala Sismica INGV-Roma 86829941
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-04 12:36:44 ± 0.06
Latitude 42.7877 ± 0.0027
Longitude 12.5627 ± 0.0049
Depth (km) 8 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 87774391

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 352
Semi-minor axis of confidence ellipse (meter) 329
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 274
Circular confidence region, given by single value of horizontal uncertainty (meter) 350.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 54
Number of associated phases, regardless of their use for origin computation 58
Number of defining phases 58
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.01709
Epicentral distance of station farthest from the epicenter (degree) 0.78241
Number of stations at which the event was observed 31
Number of stations from which data was used for origin computation 31
Magnitudes information

ML:2.1

Field Value
Value 2.1
Uncertainty 0.3
Num. used stations 42
Type of magnitude ML
Reference to an origin 86829941
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-04 12:48:31

ML:2.0

Field Value
Value 2.0
Uncertainty 0.3
Num. used stations 40
Type of magnitude ML
Reference to an origin 87774391
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-03-22 12:18:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TERO.HHZ. 2021-02-04T12:37:10.95 0.6 undecidable manual S 102 86.8464 50 0.27 42
IV.EL6.EHZ. 2021-02-04T12:37:08.35 0.6 undecidable manual S 36 74.2701 50 1.03 33
IV.BARO.HNZ. 2021-02-04T12:37:07.49 0.6 undecidable manual S 215 73.0713 50 0.5 41
IV.FIAM.HHZ. 2021-02-04T12:37:07.12 0.6 undecidable manual S 142 73.371 50 0.05 45
IV.SMA1.EHZ. 2021-02-04T12:37:05.46 0.6 undecidable manual S 105 65.3901 50 0.52 42
IV.CSP1.EHZ. 2021-02-04T12:37:04.51 0.6 undecidable manual S 57 62.0934 50 0.44 43
IV.RM33.EHZ. 2021-02-04T12:37:04.08 0.6 undecidable manual S 120 61.494 50 0.16 45
IV.MMO1.EHZ. 2021-02-04T12:37:04.74 0.6 undecidable manual S 78 63.3921 50 0.32 44
IV.SRES.HHZ. 2021-02-04T12:37:04.18 0.6 undecidable manual S 184 61.2942 50 0.34 44
IV.MC2.EHZ. 2021-02-04T12:37:02.09 0.6 undecidable manual S 75 52.8027 50 0.51 43
IV.MURB.HHZ. 2021-02-04T12:37:02.05 0.6 undecidable manual S 357 52.8027 50 0.46 43
IV.SACS.HHZ. 2021-02-04T12:37:01.89 0.6 undecidable manual S 278 53.6019 50 0.1 47
IV.TERO.HHZ. 2021-02-04T12:37:00.24 0.3 undecidable manual P 102 86.8464 50 0.74 55
IV.FDMO.HHZ. 2021-02-04T12:37:00.96 0.6 undecidable manual S 57 50.8158 50 -0.09 47
IV.ATCC.EHZ. 2021-02-04T12:36:59.28 0.6 undecidable manual S 8 44.5221 50 -0.1 47
IV.FEMA.HNE. 2021-02-04T12:36:59.38 0.3 undecidable manual S 64 44.1225 50 0.12 71
IV.NRCA.HHZ. 2021-02-04T12:36:59.55 0.6 undecidable manual S 83 45.2214 50 -0.01 48
IT.MTCL.HGZ. 2021-02-04T12:36:58.60 0.3 undecidable manual S 57 42.2244 50 -0.17 71
IV.LNSS.HHZ. 2021-02-04T12:36:58.78 0.6 undecidable manual S 118 44.0226 50 -0.47 44
IV.BARO.HNZ. 2021-02-04T12:36:58.40 0.3 undecidable manual P 215 73.0713 50 1.02 50
IV.FIAM.HHZ. 2021-02-04T12:36:57.30 0.3 undecidable manual P 142 73.371 50 -0.12 67
TV.SF03.EHN. 2021-02-04T12:36:57.61 0.3 undecidable manual P 272 71.373 50 0.49 62
IV.MGAB.HHZ. 2021-02-04T12:36:57.47 0.6 undecidable manual S 291 39.1275 50 -0.48 44
IV.MCIV.CHE. 2021-02-04T12:36:57.33 0.3 undecidable manual P 269 72.1722 50 0.09 68
IV.EL6.EHZ. 2021-02-04T12:36:57.51 0.1 undecidable manual P 36 74.2701 50 -0.06 91
IV.CESI.HHZ. 2021-02-04T12:36:56.91 0.6 undecidable manual S 49 36.741 101 -0.35 46
IV.SMA1.EHZ. 2021-02-04T12:36:56.08 0.1 undecidable manual P 105 65.3901 50 -0.11 91
IV.CSP1.EHZ. 2021-02-04T12:36:55.56 0.1 positive manual P 57 62.0934 50 -0.13 91
IV.ATVA.EHE. 2021-02-04T12:36:55.00 0.3 undecidable manual P 338 58.8966 50 -0.2 68
IV.RM33.EHZ. 2021-02-04T12:36:55.14 0.1 undecidable manual P 120 61.494 50 -0.46 85
IV.MMO1.EHZ. 2021-02-04T12:36:55.66 0.1 undecidable manual P 78 63.3921 50 -0.23 89
IV.ATLO.EHE. 2021-02-04T12:36:55.52 0.3 undecidable manual P 348 59.8956 50 0.18 68
IV.SRES.HHZ. 2021-02-04T12:36:55.12 0.3 undecidable manual P 184 61.2942 50 -0.44 64
IV.MC2.EHZ. 2021-02-04T12:36:54.13 0.1 undecidable manual P 75 52.8027 50 -0.12 93
IV.GAVE.EHZ. 2021-02-04T12:36:54.83 0.6 undecidable manual S 111 29.0487 104 0.19 48
IV.SACS.HHZ. 2021-02-04T12:36:54.01 0.1 undecidable manual P 278 53.6019 50 -0.36 88
IV.ASSB.HHZ. 2021-02-04T12:36:54.55 0.6 undecidable manual S 15 29.3484 104 -0.19 48
IV.MURB.HHZ. 2021-02-04T12:36:54.93 0.3 undecidable manual P 357 52.8027 50 0.67 60
IV.ARRO.EHZ. 2021-02-04T12:36:54.93 0.6 undecidable manual S 144 28.4493 105 0.48 45
IV.FDMO.HHZ. 2021-02-04T12:36:53.67 0.1 undecidable manual P 57 50.8158 50 -0.27 91
IT.FOPC.HGZ. 2021-02-04T12:36:52.99 0.3 undecidable manual S 29 23.1546 108 0.29 71
IV.NRCA.HHZ. 2021-02-04T12:36:52.76 0.1 undecidable manual P 83 45.2214 50 -0.32 91
IV.FEMA.HNE. 2021-02-04T12:36:52.86 0.3 undecidable manual P 64 44.1225 50 -0.05 72
IT.MTCL.HGZ. 2021-02-04T12:36:52.48 0.3 undecidable manual P 57 42.2244 50 -0.15 71
IV.ATCC.EHZ. 2021-02-04T12:36:52.95 0.3 undecidable manual P 8 44.5221 50 -0.03 72
IV.LNSS.HHZ. 2021-02-04T12:36:52.42 0.1 undecidable manual P 118 44.0226 50 -0.48 88
IV.MGAB.HHZ. 2021-02-04T12:36:51.60 0.1 undecidable manual P 291 39.1275 50 -0.55 86
IV.CESX.HHZ. 2021-02-04T12:36:51.48 0.3 undecidable manual S 174 19.9689 110 -0.16 73
IV.CESI.HHZ. 2021-02-04T12:36:51.45 0.1 undecidable manual P 49 36.741 101 -0.31 92
IV.ARRO.EHZ. 2021-02-04T12:36:50.11 0.1 undecidable manual P 144 28.4493 105 -0.02 99
IV.GAVE.EHZ. 2021-02-04T12:36:50.01 0.1 undecidable manual P 111 29.0487 104 -0.23 95
IV.ASSB.HHZ. 2021-02-04T12:36:50.23 0.3 undecidable manual P 15 29.3484 104 -0.07 74
IT.FOPC.HGZ. 2021-02-04T12:36:49.26 0.3 undecidable manual P 29 23.1546 108 0.14 73
IV.CESX.HHZ. 2021-02-04T12:36:48.59 0.1 undecidable manual P 174 19.9689 110 0.08 100
IV.MOMA.HHZ. 2021-02-04T12:36:46.05 0.1 undecidable manual P 19 1.8981 166 0.27 99
IV.MOMA.HHZ. 2021-02-04T12:36:46.90 0.3 undecidable manual S 19 1.8981 166 -0.01 78
IT.GNU.HGN. 2021-02-04T12:36:46.94 0.3 undecidable manual S 19 1.8981 166 0.03 78
IT.GNU.HGN. 2021-02-04T12:36:45.99 0.1 undecidable manual P 19 1.8981 166 0.21 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESX.HHN. ML:2.1 0.0010340027999999999 0.4608 AML other m 2021-02-04T12:36:51.78
IV.CESX.HHE. ML:2.1 0.00091248645 0.5632 AML other m 2021-02-04T12:36:52.17
IV.ARRO.EHN. ML:1.8 0.00037153825 0.1984 AML other m 2021-02-04T12:36:55.08
IV.ARRO.EHE. ML:2.0 0.0005835 0.2 AML other m 2021-02-04T12:36:55.30
IV.GAVE.EHN. ML:2.2 0.00078 0.3 AML other m 2021-02-04T12:36:55.47
IV.GAVE.HNN. ML:1.7 0.0002654726 0.2816 AML other m 2021-02-04T12:36:55.47
IV.GAVE.HNE. ML:2.3 0.0010118383 0.16 AML other m 2021-02-04T12:36:55.44
IV.GAVE.EHE. ML:2.3 0.0010806062 0.16 AML other m 2021-02-04T12:36:55.44
IV.CESI.HHE. ML:1.6 0.0001590117 0.3776 AML other m 2021-02-04T12:36:57.33
IV.CESI.HHN. ML:1.8 0.00026433605 0.7168 AML other m 2021-02-04T12:36:57.67
IV.MGAB.HHE. ML:2.0 0.0003375161 0.32 AML other m 2021-02-04T12:36:58.05
IV.MGAB.HNE. ML:2.0 0.00035827635000000005 0.3264 AML other m 2021-02-04T12:36:58.05
IV.MGAB.HHN. ML:1.9 0.00029106980000000003 0.5376 AML other m 2021-02-04T12:36:58.29
IV.MGAB.HNN. ML:2.0 0.0003390703 0.5184 AML other m 2021-02-04T12:36:58.30
IV.SACS.HNE. ML:1.8 0.00015188535 0.736 AML other m 2021-02-04T12:36:59.22
IV.LNSS.HHN. ML:2.2 0.0005958488 0.2944 AML other m 2021-02-04T12:36:59.36
IV.LNSS.HHE. ML:2.2 0.0005950284 0.5376 AML other m 2021-02-04T12:36:59.39
IV.NRCA.HHE. ML:2.2 0.0004224836 0.2752 AML other m 2021-02-04T12:36:59.80
IV.NRCA.HNE. ML:2.1 0.0003844917 0.2368 AML other m 2021-02-04T12:36:59.80
IV.NRCA.HHN. ML:2.0 0.00028831835 0.16 AML other m 2021-02-04T12:37:01.64
IV.NRCA.HNN. ML:2.0 0.00026813315 0.192 AML other m 2021-02-04T12:37:01.88
IV.FDMO.HHE. ML:1.8 0.00017299999999999998 0.28 AML other m 2021-02-04T12:37:01.83
IV.SACS.HHE. ML:1.3 0.000048333955000000005 0.2752 AML other m 2021-02-04T12:37:02.08
IV.SACS.HHN. ML:1.4 0.00006124627 0.3648 AML other m 2021-02-04T12:37:02.05
IV.FDMO.HHN. ML:1.9 0.000212 0.32 AML other m 2021-02-04T12:37:02.48
IV.MURB.HHE. ML:2.1 0.00029084719999999996 1.3184 AML other m 2021-02-04T12:37:02.36
IV.MURB.HNE. ML:2.0 0.0002468457 0.3648 AML other m 2021-02-04T12:37:02.85
IV.MURB.HNN. ML:2.2 0.00038774065000000003 0.2752 AML other m 2021-02-04T12:37:03.47
IV.MURB.HHN. ML:2.2 0.00043048390000000004 0.2624 AML other m 2021-02-04T12:37:03.60
IV.RM33.HNE. ML:2.1 0.00023463845 0.6784 AML other m 2021-02-04T12:37:04.74
IV.SRES.HHE. ML:1.6 0.00007639924 0.64 AML other m 2021-02-04T12:37:04.47
IV.SRES.HHN. ML:1.4 0.000049892544999999993 0.3584 AML other m 2021-02-04T12:37:04.79
IV.CSP1.EHN. ML:2.3 0.00038377859999999997 0.2816 AML other m 2021-02-04T12:37:04.84
IV.RM33.EHE. ML:2.0 0.00018854389999999998 0.4224 AML other m 2021-02-04T12:37:05.03
IV.CSP1.EHE. ML:2.4 0.0005700000000000001 1.7 AML other m 2021-02-04T12:37:05.12
IV.SMA1.EHE. ML:2.6 0.000762 1.54 AML other m 2021-02-04T12:37:06.99
IV.SMA1.EHN. ML:2.5 0.0005660000000000001 1.7 AML other m 2021-02-04T12:37:07.10
IV.FIAM.HHE. ML:1.4 0.000038398725000000004 0.7424 AML other m 2021-02-04T12:37:08.05
IV.EL6.EHE. ML:2.3 0.000282 1.7 AML other m 2021-02-04T12:37:09.90
IV.EL6.EHN. ML:2.2 0.00023050000000000002 0.52 AML other m 2021-02-04T12:37:09.49
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