Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 16-03-2021 and time 23:47:54 (Italy) in region 6 km NW Massa Martana (PG)

A magnitude ML 1.3 earthquake occured in region: 6 km NW Massa Martana (PG), on

  • 16-03-2021 22:47:54 (UTC)
  • 16-03-2021 23:47:54 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8240, 12.4900 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
Massa Martana PG 6 3770 3770
Giano dell'Umbria PG 7 3846 7616
Todi PG 8 16851 24467
Collazzone PG 9 3473 27940
Fratta Todina PG 11 1839 29779
Gualdo Cattaneo PG 11 6155 35934
Monte Castello di Vibio PG 11 1567 37501
Castel Ritaldi PG 15 3278 40779
Acquasparta TR 15 4778 45557
Montefalco PG 16 5679 51236
Marsciano PG 16 18902 70138
Bevagna PG 16 5081 75219
Deruta PG 19 9669 84888
San Venanzo TR 19 2218 87106
Montecastrilli TR 19 5022 92128
Avigliano Umbro TR 19 2558 94686

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km SW of Foligno (57155 inhabitants)
32 Km NW of Terni (111501 inhabitants)
33 Km S of Perugia (166134 inhabitants)
55 Km NE of Viterbo (67173 inhabitants)
87 Km SE of Arezzo (99543 inhabitants)
91 Km NW of L'Aquila (69753 inhabitants)
94 Km N of Guidonia Montecelio (88673 inhabitants)
99 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
Reviewed
Rev100 		ML 1.3 2021-03-16
22:47:54		 42.8237 12.4902 8 2021-03-16
23:02:42		 Sala Sismica INGV-Roma 88195021
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-16 22:47:54 ± 0.09
Latitude 42.8237 ± 0.0045
Longitude 12.4902 ± 0.0061
Depth (km) 8 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 88195021

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 532
Semi-minor axis of confidence ellipse (meter) 383
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 230
Circular confidence region, given by single value of horizontal uncertainty (meter) 530.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 126
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
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) 0.06205
Epicentral distance of station farthest from the epicenter (degree) 0.58726
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 88195021
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-16 23:02:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-03-16T22:48:15.44 0.1 undecidable manual S 63 65.1903 50 0.44 83
IV.MURB.HHZ. 2021-03-16T22:48:11.21 0.1 undecidable manual S 3 48.8178 50 0.59 82
IV.NRCA.HHZ. 2021-03-16T22:48:11.04 0.1 undecidable manual S 89 50.8158 50 -0.11 92
IV.ATCC.EHZ. 2021-03-16T22:48:08.46 0.1 undecidable manual S 17 41.9247 50 -0.31 89
IV.GAVE.EHZ. 2021-03-16T22:48:07.05 0.1 undecidable manual S 114 36.0417 50 -0.15 93
IV.CSP1.EHZ. 2021-03-16T22:48:06.38 0.1 undecidable manual P 63 65.1903 50 0.06 90
IV.ARRO.EHE. 2021-03-16T22:48:06.95 0.1 undecidable manual S 140 35.2425 50 -0.04 96
IV.MGAB.HHZ. 2021-03-16T22:48:05.74 0.1 undecidable manual S 288 32.2455 104 -0.27 91
IV.CESX.HHZ. 2021-03-16T22:48:03.59 0.1 undecidable manual S 162 25.1526 108 -0.04 97
IT.FOPC.HGZ. 2021-03-16T22:48:03.21 0.1 undecidable manual S 47 23.6541 109 0.05 97
IV.MURB.HHZ. 2021-03-16T22:48:03.88 0.1 undecidable manual P 3 48.8178 50 0.09 92
IV.NRCA.HHZ. 2021-03-16T22:48:03.64 0.1 undecidable manual P 89 50.8158 50 -0.46 85
IV.ATCC.EHZ. 2021-03-16T22:48:02.37 0.1 undecidable manual P 17 41.9247 50 -0.36 88
IV.GAVE.EHZ. 2021-03-16T22:48:01.63 0.1 undecidable manual P 114 36.0417 50 -0.19 93
IV.ARRO.EHE. 2021-03-16T22:48:01.73 0.1 undecidable manual P 140 35.2425 50 0.03 96
IV.MGAB.HHZ. 2021-03-16T22:48:01.20 0.1 undecidable manual P 288 32.2455 104 0.07 95
IV.CESX.HHZ. 2021-03-16T22:48:00.58 0.1 undecidable manual P 162 25.1526 108 0.82 78
IT.FOPC.HGZ. 2021-03-16T22:47:59.49 0.1 undecidable manual P 47 23.6541 109 0.01 98
IV.MOMA.HHZ. 2021-03-16T22:47:58.09 0.1 undecidable manual S 109 6.8931 140 -0.05 100
IT.GNU.HGZ. 2021-03-16T22:47:57.89 0.1 undecidable manual S 109 6.8931 140 -0.26 96
IT.GNU.HGZ. 2021-03-16T22:47:56.69 0.1 undecidable manual P 109 6.8931 140 0.09 99
IV.MOMA.HHZ. 2021-03-16T22:47:56.72 0.1 positive manual P 109 6.8931 140 0.12 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHE. ML:1.7 0.000877 0.3 AML other m 2021-03-16T22:47:58.27
IV.MOMA.HNE. ML:1.6 0.0008115000000000002 0.3 AML other m 2021-03-16T22:47:58.27
IV.MOMA.HHN. ML:1.4 0.000445 0.32 AML other m 2021-03-16T22:47:58.13
IV.MOMA.HNN. ML:1.4 0.0004005 0.9 AML other m 2021-03-16T22:48:00.07
IV.MGAB.HHE. ML:0.9 0.00003685 0.6 AML other m 2021-03-16T22:48:07.21
IV.GAVE.EHE. ML:1.1 0.0000517 0.34 AML other m 2021-03-16T22:48:07.70
IV.MGAB.HHN. ML:1.0 0.00003825 0.16 AML other m 2021-03-16T22:48:08.03
IV.GAVE.EHN. ML:1.1 0.000054900000000000006 0.52 AML other m 2021-03-16T22:48:09.72
IV.NRCA.HHE. ML:1.1 0.00003515 0.66 AML other m 2021-03-16T22:48:11.21
IV.MURB.HHN. ML:1.5 0.0000852 1.12 AML other m 2021-03-16T22:48:12.69
IV.MURB.HHE. ML:1.6 0.0001046 0.22 AML other m 2021-03-16T22:48:13.20
IV.NRCA.HHN. ML:1.2 0.00003985 0.92 AML other m 2021-03-16T22:48:14.76
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