Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 16-03-2021 and time 20:23:17 (Italy) in region 5 km NW Massa Martana (PG)

A magnitude ML 2.0 earthquake occured in region: 5 km NW Massa Martana (PG), on

  • 16-03-2021 19:23:17 (UTC)
  • 16-03-2021 20:23:17 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8160, 12.4920 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 5 3770 3770
Giano dell'Umbria PG 7 3846 7616
Todi PG 8 16851 24467
Collazzone PG 10 3473 27940
Fratta Todina PG 11 1839 29779
Monte Castello di Vibio PG 12 1567 31346
Gualdo Cattaneo PG 12 6155 37501
Acquasparta TR 15 4778 42279
Castel Ritaldi PG 15 3278 45557
Montefalco PG 16 5679 51236
Marsciano PG 16 18902 70138
Bevagna PG 16 5081 75219
Montecastrilli TR 18 5022 80241
Avigliano Umbro TR 19 2558 82799
San Venanzo TR 19 2218 85017
Deruta PG 20 9669 94686

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km SW of Foligno (57155 inhabitants)
31 Km NW of Terni (111501 inhabitants)
34 Km S of Perugia (166134 inhabitants)
54 Km NE of Viterbo (67173 inhabitants)
88 Km SE of Arezzo (99543 inhabitants)
90 Km NW of L'Aquila (69753 inhabitants)
93 Km N of Guidonia Montecelio (88673 inhabitants)
98 Km N of Tivoli (56533 inhabitants)
99 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 2021-03-16
19:23:17		 42.8157 12.4918 8 2021-07-12
16:55:04		 Bollettino Sismico Italiano INGV 88588001
Reviewed
Rev100 		ML 2.1 2021-03-16
19:23:17		 42.8157 12.4998 8 2021-03-16
19:35:23		 Sala Sismica INGV-Roma 88189491
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-16 19:23:17 ± 0.07
Latitude 42.8157 ± 0.0036
Longitude 12.4918 ± 0.0049
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 88588001

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 427
Semi-minor axis of confidence ellipse (meter) 368
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 77
Circular confidence region, given by single value of horizontal uncertainty (meter) 430.0
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 52
Number of defining phases 47
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.29
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.72935
Number of stations at which the event was observed 31
Number of stations from which data was used for origin computation 26
Magnitudes information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.2
Num. used stations 23
Type of magnitude ML
Reference to an origin 88588001
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-04-06 10:47:18

ML:2.1

Field Value
Value 2.1
Uncertainty 0.3
Num. used stations 25
Type of magnitude ML
Reference to an origin 88189491
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-16 19:35:23
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VENL.HNZ. 2021-03-16T19:24:30.84 3.0 undecidable manual Sn -0.65 0
IV.RNI2.HHZ. 2021-03-16T19:24:09.24 3.0 undecidable manual Sn 0.46 0
OT.OT14.EHZ. 2021-03-16T19:24:04.30 3.0 undecidable manual Pn 3.99 0
IV.PTRJ.HNZ. 2021-03-16T19:23:56.79 3.0 undecidable manual Pg 4.62 0
IV.MF5.EHZ. 2021-03-16T19:23:43.60 0.6 undecidable manual S 76 80.9523 50 1.48 26
IV.EL6.EHZ. 2021-03-16T19:23:41.17 0.6 undecidable manual S 41 75.4689 50 0.52 41
IV.BARO.HNE. 2021-03-16T19:23:39.82 0.6 undecidable manual S 210 72.5718 50 -0.06 46
IV.MMO1.EHZ. 2021-03-16T19:23:38.90 0.6 undecidable manual S 82 68.4759 50 0.09 46
IV.CSP1.EHZ. 2021-03-16T19:23:38.54 0.6 undecidable manual S 62 65.49 50 0.54 42
IV.ATFO.HHZ. 2021-03-16T19:23:37.78 0.3 undecidable manual S 6 61.494 50 0.86 55
IV.CPGN.EHZ. 2021-03-16T19:23:37.72 3.0 undecidable manual P 1.12 0
IV.MC2.EHZ. 2021-03-16T19:23:36.83 0.6 undecidable manual S 79 57.6978 50 0.92 36
IV.FOSV.EHZ. 2021-03-16T19:23:36.03 0.6 undecidable manual S 22 57.498 50 0.18 46
IV.MURB.HHZ. 2021-03-16T19:23:34.08 0.6 undecidable manual S 3 49.7169 50 0.3 45
IV.NRCA.HHZ. 2021-03-16T19:23:33.95 0.6 undecidable manual S 88 50.7159 50 -0.09 47
IV.SACS.HHZ. 2021-03-16T19:23:33.46 0.6 undecidable manual S 275 47.5191 50 0.26 46
IV.LNSS.HHZ. 2021-03-16T19:23:33.72 0.6 undecidable manual S 118 50.5161 50 -0.29 45
IV.MF5.EHZ. 2021-03-16T19:23:31.91 0.1 undecidable manual P 76 80.9523 50 0.29 86
IV.ATCC.EHZ. 2021-03-16T19:23:31.59 0.6 undecidable manual S 16 42.7239 50 -0.32 46
IV.EL6.EHZ. 2021-03-16T19:23:30.60 0.1 undecidable manual P 41 75.4689 50 -0.17 89
IV.BARO.HNE. 2021-03-16T19:23:30.99 0.3 undecidable manual P 210 72.5718 50 0.67 59
IV.CESI.HHZ. 2021-03-16T19:23:30.84 0.6 undecidable manual S 58 39.5271 50 -0.23 47
IV.CSP1.EHZ. 2021-03-16T19:23:29.04 0.1 undecidable manual P 62 65.49 50 -0.2 90
IV.ARRO.EHZ. 2021-03-16T19:23:29.84 0.6 undecidable manual S 140 34.4433 102 0.35 46
IV.SRES.HHN. 2021-03-16T19:23:29.83 0.3 undecidable manual P 179 64.1913 50 0.79 57
IV.GAVE.EHZ. 2021-03-16T19:23:29.75 0.6 undecidable manual S 113 35.5422 102 -0.11 49
IV.MMO1.EHZ. 2021-03-16T19:23:29.42 0.1 undecidable manual P 82 68.4759 50 -0.28 88
IV.RM33.EHZ. 2021-03-16T19:23:29.20 0.3 undecidable manual P 120 68.0763 50 -0.43 64
IV.MGAB.HHZ. 2021-03-16T19:23:29.01 0.6 undecidable manual S 289 32.745 103 0.1 49
IV.ATFO.HHZ. 2021-03-16T19:23:28.69 0.3 undecidable manual P 6 61.494 50 0.07 70
IV.ATMI.HHZ. 2021-03-16T19:23:28.69 0.3 undecidable manual P 343 60.2952 50 0.25 68
IV.FOSV.EHZ. 2021-03-16T19:23:27.75 0.3 undecidable manual P 22 57.498 50 -0.25 68
IV.ATVA.EHN. 2021-03-16T19:23:27.04 0.3 undecidable manual P 342 54.0015 50 -0.43 66
IV.MC2.EHZ. 2021-03-16T19:23:27.82 0.1 undecidable manual P 79 57.6978 50 -0.21 91
IV.ATLO.HNN. 2021-03-16T19:23:27.55 0.1 undecidable manual P 353 55.7997 50 -0.2 92
IV.LNSS.HHZ. 2021-03-16T19:23:26.47 0.1 undecidable manual P 118 50.5161 50 -0.47 88
IV.CESX.HHZ. 2021-03-16T19:23:26.04 0.3 undecidable manual S 161 24.2535 107 -0.03 75
IV.NRCA.HHZ. 2021-03-16T19:23:26.58 0.1 undecidable manual P 88 50.7159 50 -0.38 89
IT.FOPC.HGZ. 2021-03-16T19:23:26.31 0.6 undecidable manual S 45 24.2535 107 0.25 48
IV.SACS.HHZ. 2021-03-16T19:23:26.32 0.1 undecidable manual P 275 47.5191 50 -0.14 94
IV.MURB.HHZ. 2021-03-16T19:23:26.56 0.3 undecidable manual P 3 49.7169 50 -0.24 69
IV.ATCC.EHZ. 2021-03-16T19:23:25.27 0.1 undecidable manual P 16 42.7239 50 -0.45 89
IV.CESI.HHZ. 2021-03-16T19:23:24.94 0.1 undecidable manual P 58 39.5271 50 -0.3 93
IV.ARRO.EHZ. 2021-03-16T19:23:24.48 0.3 undecidable manual P 140 34.4433 102 0.15 72
IV.GAVE.EHZ. 2021-03-16T19:23:24.18 0.1 undecidable manual P 113 35.5422 102 -0.36 92
IV.MGAB.HHZ. 2021-03-16T19:23:23.87 0.3 undecidable manual P 289 32.745 103 -0.12 73
IV.CESX.HHZ. 2021-03-16T19:23:22.41 0.3 undecidable manual P 161 24.2535 107 0.05 75
IT.FOPC.HGZ. 2021-03-16T19:23:22.47 0.3 undecidable manual P 45 24.2535 107 0.12 74
IV.MOMA.HHZ. 2021-03-16T19:23:20.72 0.6 undecidable manual S 102 6.4935 139 0.01 52
IT.GNU.HGZ. 2021-03-16T19:23:20.67 0.6 undecidable manual S 102 6.4935 139 -0.04 52
IT.GNU.HGZ. 2021-03-16T19:23:19.46 0.1 positive manual P 102 6.4935 139 0.21 100
IV.MOMA.HHZ. 2021-03-16T19:23:19.48 0.1 positive manual P 102 6.4935 139 0.22 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESX.HHN. ML:1.6 0.00023788169999999998 0.8832 AML other m 2021-03-16T19:23:26.68
IV.CESX.HHE. ML:1.4 0.000169333345 0.8576 AML other m 2021-03-16T19:23:26.39
IV.MGAB.HHN. ML:1.7 0.000237991 0.4352 AML other m 2021-03-16T19:23:29.18
IV.MGAB.HNN. ML:1.8 0.0002575772 0.4608 AML other m 2021-03-16T19:23:29.18
IV.MGAB.HNE. ML:1.8 0.00028139823999999994 0.448 AML other m 2021-03-16T19:23:29.21
IV.MGAB.HHE. ML:1.8 0.0003048735 0.4352 AML other m 2021-03-16T19:23:29.22
IV.GAVE.EHN. ML:1.8 0.00029073970000000006 0.3584 AML other m 2021-03-16T19:23:29.90
IV.GAVE.EHE. ML:2.2 0.0006065068499999999 0.1792 AML other m 2021-03-16T19:23:30.26
IV.GAVE.HNE. ML:2.3 0.0008081593999999999 0.4608 AML other m 2021-03-16T19:23:30.58
IV.CESI.HHE. ML:2.1 0.0004285 1.74 AML other m 2021-03-16T19:23:30.93
IV.CESI.HHN. ML:2.2 0.0005549999999999999 0.22 AML other m 2021-03-16T19:23:31.14
IV.ATCC.EHE. ML:1.8 0.00022145606499999999 0.32 AML other m 2021-03-16T19:23:32.11
IV.ATCC.EHN. ML:1.7 0.00017161985000000002 0.2816 AML other m 2021-03-16T19:23:32.17
IV.SACS.HHN. ML:1.4 0.000063450165 0.3328 AML other m 2021-03-16T19:23:34.04
IV.MURB.HHN. ML:2.0 0.00023262545 0.32 AML other m 2021-03-16T19:23:34.41
IV.MURB.HNN. ML:1.9 0.0002322941 0.3712 AML other m 2021-03-16T19:23:34.41
IV.LNSS.HHN. ML:1.9 0.00021489970000000003 0.1792 AML other m 2021-03-16T19:23:34.34
IV.NRCA.HHE. ML:2.2 0.00039648485 0.1664 AML other m 2021-03-16T19:23:34.46
IV.MURB.HHE. ML:2.2 0.000385733625 0.2176 AML other m 2021-03-16T19:23:34.37
IV.LNSS.HHE. ML:2.1 0.0003515 0.18 AML other m 2021-03-16T19:23:34.48
IV.MURB.HNE. ML:2.1 0.0003715094 0.2432 AML other m 2021-03-16T19:23:34.37
IV.NRCA.HHN. ML:2.0 0.00028382454999999993 0.6144 AML other m 2021-03-16T19:23:34.46
IV.CSP1.EHN. ML:2.3 0.0003743514 0.3584 AML other m 2021-03-16T19:23:39.31
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