Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 27-02-2021 and time 21:47:34 (Italy) in region 1 km N Massa Martana (PG)

A magnitude ML 1.5 earthquake occured in region: 1 km N Massa Martana (PG), on

  • 27-02-2021 20:47:34 (UTC)
  • 27-02-2021 21:47:34 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7890, 12.5230 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

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 1 3770 3770
Giano dell'Umbria PG 7 3846 7616
Todi PG 9 16851 24467
Acquasparta TR 11 4778 29245
Castel Ritaldi PG 13 3278 32523
Collazzone PG 14 3473 35996
Gualdo Cattaneo PG 14 6155 42151
Fratta Todina PG 15 1839 43990
Monte Castello di Vibio PG 15 1567 45557
Montecastrilli TR 16 5022 50579
Montefalco PG 16 5679 56258
Avigliano Umbro TR 17 2558 58816
Bevagna PG 18 5081 63897
Spoleto PG 19 38218 102115
San Gemini TR 20 5018 107133

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km SW of Foligno (57155 inhabitants)
27 Km NW of Terni (111501 inhabitants)
37 Km SE of Perugia (166134 inhabitants)
54 Km NE of Viterbo (67173 inhabitants)
87 Km NW of L'Aquila (69753 inhabitants)
89 Km N of Guidonia Montecelio (88673 inhabitants)
92 Km SE of Arezzo (99543 inhabitants)
94 Km N of Tivoli (56533 inhabitants)
98 Km W of Teramo (54892 inhabitants)
98 Km NE of Civitavecchia (52991 inhabitants)
100 Km N of Roma (2864731 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 1.5 2021-02-27
20:47:34		 42.789 12.5233 8 2021-07-12
16:55:01		 Bollettino Sismico Italiano INGV 87781251
Reviewed
Rev100 		ML 1.6 2021-02-27
20:47:35		 42.7932 12.5288 8 2021-02-27
20:57:57		 Sala Sismica INGV-Roma 87549931
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-27 20:47:34 ± 0.08
Latitude 42.7890 ± 0.0045
Longitude 12.5233 ± 0.0061
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 87781251

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 582
Semi-minor axis of confidence ellipse (meter) 372
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 229
Circular confidence region, given by single value of horizontal uncertainty (meter) 580.0
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 42
Number of defining phases 30
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.68528
Number of stations at which the event was observed 30
Number of stations from which data was used for origin computation 18
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 30
Type of magnitude ML
Reference to an origin 87549931
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-27 20:57:57

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 21
Type of magnitude ML
Reference to an origin 87781251
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-03-05 15:01:15
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SLCN.HHZ. 2021-02-27T20:49:20.45 3.0 undecidable manual Sg 12.08 0
IV.BULG.HHZ. 2021-02-27T20:49:20.07 3.0 undecidable manual Sg 8.94 0
GU.BLANC.HHZ. 2021-02-27T20:49:07.29 3.0 undecidable manual Pg 16.610001 0
IV.GRI.EHZ. 2021-02-27T20:48:58.74 3.0 undecidable manual Pg 9.27 0
IV.CADC.EHZ. 2021-02-27T20:48:34.79 3.0 negative manual Pg 9.86 0
IV.PCN.EHZ. 2021-02-27T20:48:25.50 3.0 undecidable manual Pn 2.62 0
IV.PAOL.HHZ. 2021-02-27T20:48:17.64 3.0 negative manual Pg 4.13 0
IV.NDIM.HNZ. 2021-02-27T20:48:14.38 3.0 positive manual Pn 0.04 0
IV.ZCCA.HHZ. 2021-02-27T20:48:12.78 3.0 negative manual Pg 5 0
IV.PTRJ.HNZ. 2021-02-27T20:48:10.07 3.0 undecidable manual Pn 0.21 0
IV.RINC.HHZ. 2021-02-27T20:47:59.02 3.0 undecidable manual P 0.03 0
IV.CSP1.EHZ. 2021-02-27T20:47:56.19 0.6 undecidable manual S 59 64.7907 50 0.89 35
IV.NRCA.HHZ. 2021-02-27T20:47:51.28 0.6 undecidable manual S 84 48.3183 50 0.36 43
IV.ATCC.EHE. 2021-02-27T20:47:50.23 0.6 undecidable manual S 12 44.9217 50 0.21 45
IV.LNSS.HHZ. 2021-02-27T20:47:50.68 0.6 undecidable manual S 116 46.9197 50 0.14 46
IV.MF5.EHZ. 2021-02-27T20:47:49.15 3.0 positive manual P -0.22 0
IV.CESI.HHZ. 2021-02-27T20:47:48.74 0.6 undecidable manual S 52 39.1275 50 0.27 45
IV.MGAB.HHZ. 2021-02-27T20:47:48.07 0.3 undecidable manual S 292 36.1416 102 0.42 66
IV.EL6.EHZ. 2021-02-27T20:47:48.39 0.3 undecidable manual P 38 76.0683 50 0 67
IV.ATMI.HHE. 2021-02-27T20:47:47.04 0.3 undecidable manual P 341 63.8916 50 0.52 61
IV.GAVE.EHZ. 2021-02-27T20:47:46.33 0.3 undecidable manual S 109 32.0457 104 0.06 71
IV.CSP1.EHZ. 2021-02-27T20:47:46.56 0.3 undecidable manual P 59 64.7907 50 -0.08 67
IV.ARRO.EHZ. 2021-02-27T20:47:46.20 0.3 undecidable manual S 140 30.5472 104 0.45 66
IV.SRES.HHN. 2021-02-27T20:47:45.31 0.3 undecidable manual P 181 61.2942 50 -0.79 55
IV.ATLO.EHN. 2021-02-27T20:47:45.33 0.3 undecidable manual P 351 59.0964 50 -0.45 63
IV.ATVA.EHN. 2021-02-27T20:47:45.20 0.3 undecidable manual P 341 57.5979 50 -0.35 64
IV.MURB.HNN. 2021-02-27T20:47:44.57 0.3 undecidable manual P 0 52.6029 50 -0.2 67
IT.FOPC.HGZ. 2021-02-27T20:47:44.44 0.6 undecidable manual S 36 24.8529 107 0.6 42
IV.ATCC.EHE. 2021-02-27T20:47:43.30 0.3 undecidable manual P 12 44.9217 50 -0.3 66
IV.LNSS.HHZ. 2021-02-27T20:47:43.72 0.3 undecidable manual P 116 46.9197 50 -0.18 68
IV.NRCA.HHZ. 2021-02-27T20:47:43.90 0.1 undecidable manual P 84 48.3183 50 -0.22 90
IV.MGAB.HHZ. 2021-02-27T20:47:42.61 0.3 undecidable manual P 292 36.1416 102 0.38 66
IV.CESX.HHZ. 2021-02-27T20:47:42.92 0.3 undecidable manual S 166 20.6682 111 0.44 67
IV.CESI.HHZ. 2021-02-27T20:47:42.43 0.1 undecidable manual P 52 39.1275 50 -0.27 90
IV.GAVE.EHZ. 2021-02-27T20:47:41.25 0.3 undecidable manual P 109 32.0457 104 -0.18 70
IV.ARRO.EHZ. 2021-02-27T20:47:41.06 0.3 undecidable manual P 140 30.5472 104 -0.07 72
IT.FOPC.HGZ. 2021-02-27T20:47:40.24 0.3 undecidable manual P 36 24.8529 107 0.22 70
IV.CESX.HHZ. 2021-02-27T20:47:39.27 0.3 undecidable manual P 166 20.6682 111 0.03 73
IV.MOMA.HHZ. 2021-02-27T20:47:37.57 0.3 undecidable manual S 66 4.1958 152 -0.3 71
IT.GNU.HGZ. 2021-02-27T20:47:37.63 0.1 undecidable manual S 67 4.1958 152 -0.24 96
IV.MOMA.HHZ. 2021-02-27T20:47:36.52 0.1 negative manual P 66 4.1958 152 -0.06 100
IT.GNU.HGZ. 2021-02-27T20:47:36.51 0.1 negative manual P 67 4.1958 152 -0.07 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.HNN. ML:1.6 0.0001724646 4.4544 AML other m 2021-02-27T20:47:47.19
IV.CESX.HHN. ML:1.5 0.000227 0.3 AML other m 2021-02-27T20:47:45.24
IV.CESX.HHE. ML:1.4 0.00020500000000000002 0.3 AML other m 2021-02-27T20:47:45.43
IV.GAVE.HNE. ML:1.5 0.00016109753199999998 0.1536 AML other m 2021-02-27T20:47:48.18
IV.MGAB.HNE. ML:1.6 0.00014421045 0.64 AML other m 2021-02-27T20:47:48.20
IV.GAVE.EHE. ML:1.5 0.00014700000000000002 0.18 AML other m 2021-02-27T20:47:48.50
IV.ARRO.EHE. ML:1.2 0.0000713 1.02 AML other m 2021-02-27T20:47:48.06
IV.CESI.HHN. ML:1.3 0.000066847915 0.1408 AML other m 2021-02-27T20:47:49.11
IV.ARRO.EHN. ML:1.2 0.00007249775 0.1792 AML other m 2021-02-27T20:47:49.55
IV.GAVE.EHN. ML:1.4 0.00013014344999999998 0.2432 AML other m 2021-02-27T20:47:49.42
IV.MGAB.HHE. ML:1.1 0.000049820935 0.2048 AML other m 2021-02-27T20:47:50.34
IV.MGAB.HHN. ML:1.2 0.00005979630500000001 0.1664 AML other m 2021-02-27T20:47:52.11
IV.LNSS.HHN. ML:1.5 0.00008709781 0.1408 AML other m 2021-02-27T20:47:52.33
IV.LNSS.HHE. ML:1.6 0.00011627691500000001 0.512 AML other m 2021-02-27T20:47:52.47
IV.NRCA.HHE. ML:1.5 0.000092724215 0.1408 AML other m 2021-02-27T20:47:53.95
IV.NRCA.HHN. ML:1.7 0.0001285 0.12 AML other m 2021-02-27T20:47:54.50
IV.MGAB.HNN. ML:1.6 0.00014039544999999996 1.3856 AML other m 2021-02-27T20:47:55.19
IV.NRCA.HNE. ML:1.7 0.000143186805 0.5376 AML other m 2021-02-27T20:47:57.88
IV.NRCA.HNN. ML:1.8 0.00017587399 0.832 AML other m 2021-02-27T20:47:58.55
IV.CSP1.EHN. ML:1.8 0.000109693655 0.5536 AML other m 2021-02-27T20:48:08.90
IV.CSP1.EHE. ML:1.8 0.00011018805000000001 1.3824 AML other m 2021-02-27T20:48:10.05
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