Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.1 on date 08-04-2021 and time 16:16:39 (UTC) in region 3 km SW Valfabbrica (PG)

A magnitude ML 2.1 earthquake occured in region: 3 km SW Valfabbrica (PG), on

  • 08-04-2021 16:16:39 (UTC)
  • 08-04-2021 18:16:39 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.1420, 12.5690 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
Valfabbrica PG 3 3389 3389
Bastia Umbra PG 8 21874 25263
Assisi PG 9 28299 53562
Perugia PG 15 166134 219696
Bettona PG 16 4367 224063
Cannara PG 16 4305 228368
Torgiano PG 17 6725 235093
Valtopina PG 18 1398 236491
Nocera Umbra PG 18 5839 242330
Spello PG 19 8645 250975

Municipalities with at least 50000 inhabitants

An earthquake occurred to
15 Km E of Perugia (166134 inhabitants)
23 Km NW of Foligno (57155 inhabitants)
65 Km N of Terni (111501 inhabitants)
66 Km SE of Arezzo (99543 inhabitants)
86 Km SW of Fano (60888 inhabitants)
89 Km NE of Viterbo (67173 inhabitants)
90 Km SW of Pesaro (94582 inhabitants)
93 Km SW of Ancona (100861 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 2.1 2021-04-08
16:16:39		 43.1422 12.5688 9 2021-07-12
16:55:13		 Bollettino Sismico Italiano INGV 90703551
Reviewed
Rev100 		ML 2.1 2021-04-08
16:16:39		 43.1412 12.5712 10 2021-04-08
16:31:52		 Sala Sismica INGV-Roma 88920381
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-08 16:16:39 ± 0.04
Latitude 43.1422 ± 0.0018
Longitude 12.5688 ± 0.0037
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 90703551

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 325
Semi-minor axis of confidence ellipse (meter) 144
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 69
Circular confidence region, given by single value of horizontal uncertainty (meter) 330.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 56
Number of associated phases, regardless of their use for origin computation 47
Number of defining phases 47
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.06745
Epicentral distance of station farthest from the epicenter (degree) 0.91821
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 0.2
Num. used stations 29
Type of magnitude ML
Reference to an origin 90703551
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-01 19:03:22

ML:2.1

Field Value
Value 2.1
Uncertainty 0.2
Num. used stations 25
Type of magnitude ML
Reference to an origin 88920381
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-08 16:31:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TERO.HHZ. 2021-04-08T16:16:57.85 1.0 undecidable manual P 124 101.9202 50 0.94 16
IV.APEC.HNN. 2021-04-08T16:16:55.56 0.3 undecidable manual S 345 47.7189 50 0.34 66
IV.FRON.EHZ. 2021-04-08T16:16:54.02 0.3 undecidable manual S 17 43.5231 50 -0.09 71
IV.MGAB.HHZ. 2021-04-08T16:16:54.62 0.6 undecidable manual S 236 44.9217 50 0.14 46
IV.PIEI.HNN. 2021-04-08T16:16:54.36 0.3 undecidable manual S 356 43.7229 50 0.2 69
IV.ATPC.HHE. 2021-04-08T16:16:53.01 0.3 undecidable manual S 347 38.628 50 0.22 69
IV.SSFR.HHN. 2021-04-08T16:16:52.22 0.3 undecidable manual S 28 36.9297 50 -0.11 71
IV.ATPI.EHE. 2021-04-08T16:16:52.19 0.3 undecidable manual S 339 36.741 50 -0.11 71
IV.ATBU.EHZ. 2021-04-08T16:16:52.65 0.3 undecidable manual S 357 37.0296 50 0.28 69
IV.ATSC.EHE. 2021-04-08T16:16:51.11 0.3 undecidable manual S 17 32.6451 105 -0.05 72
IV.PARC.HHZ. 2021-04-08T16:16:51.07 1.0 undecidable manual P 335 62.1933 50 0.29 22
IV.MML1.HNE. 2021-04-08T16:16:51.18 0.3 undecidable manual S 95 32.745 105 -0.01 73
IV.PE3.EHZ. 2021-04-08T16:16:51.24 0.3 undecidable manual P 355 61.6938 50 0.53 62
IV.SACS.HHZ. 2021-04-08T16:16:51.03 0.3 undecidable manual P 239 62.5929 50 0.18 67
IV.MC2.EHZ. 2021-04-08T16:16:50.06 0.3 undecidable manual P 117 56.3991 50 0.16 68
IV.TB03.DHZ.01 2021-04-08T16:16:50.57 0.6 undecidable manual S 336 31.4463 105 -0.19 47
IV.CAFI.HHZ. 2021-04-08T16:16:49.23 0.1 undecidable manual P 293 52.9026 50 -0.13 92
IV.GAVE.EHZ. 2021-04-08T16:16:49.81 0.1 undecidable manual P 152 56.499 50 -0.09 92
IV.TB01.DHZ.01 2021-04-08T16:16:49.67 0.3 undecidable manual S 338 28.6491 106 -0.15 71
IV.APEC.HNN. 2021-04-08T16:16:48.60 0.1 undecidable manual P 345 47.7189 50 0.05 94
IV.MGAB.HHZ. 2021-04-08T16:16:47.93 0.3 undecidable manual P 236 44.9217 50 -0.2 69
IV.PIEI.HNN. 2021-04-08T16:16:47.82 0.3 undecidable manual P 356 43.7229 50 -0.12 70
IV.FRON.EHZ. 2021-04-08T16:16:47.60 0.3 undecidable manual P 17 43.5231 50 -0.31 67
IT.FOPC.HGZ. 2021-04-08T16:16:47.91 0.6 undecidable manual S 150 21.9669 111 0.28 47
IV.ATPC.HHE. 2021-04-08T16:16:47.09 0.1 undecidable manual P 347 38.628 50 -0.06 95
IV.ATBU.EHZ. 2021-04-08T16:16:46.93 0.1 undecidable manual P 357 37.0296 50 0.02 96
IV.MOMA.HHZ. 2021-04-08T16:16:46.71 1.0 negative manual P 180 37.5291 50 -0.27 23
IV.SSFR.HHN. 2021-04-08T16:16:46.64 0.3 undecidable manual P 28 36.9297 50 -0.25 69
IV.ATSC.EHE. 2021-04-08T16:16:46.04 0.3 undecidable manual P 17 32.6451 105 -0.17 71
IV.ATMI.HHE. 2021-04-08T16:16:46.50 0.1 undecidable manual P 311 32.3454 105 0.35 91
IV.ATPI.EHE. 2021-04-08T16:16:46.54 0.1 undecidable manual P 339 36.741 50 -0.33 90
IV.MML1.HNE. 2021-04-08T16:16:46.00 0.1 positive manual P 95 32.745 105 -0.23 93
IV.MURB.HNZ. 2021-04-08T16:16:45.60 0.6 undecidable manual S 345 13.875 121 0.51 45
IV.CESI.HNN. 2021-04-08T16:16:45.77 0.1 undecidable manual P 119 31.1466 105 -0.15 95
IV.TB02.DHE. 2021-04-08T16:16:45.15 0.1 undecidable manual P 333 28.4493 107 -0.24 94
IV.TB03.DHZ.01 2021-04-08T16:16:45.84 0.3 undecidable manual P 336 31.4463 105 -0.14 71
IV.ATVA.EHN. 2021-04-08T16:16:45.04 0.1 undecidable manual P 304 27.4503 107 -0.17 95
IV.TB01.DHZ.01 2021-04-08T16:16:45.20 0.3 undecidable manual P 338 28.6491 106 -0.24 70
IV.ATLO.EHN. 2021-04-08T16:16:44.23 0.3 undecidable manual P 326 23.2545 110 -0.17 72
IV.ATFO.HHE. 2021-04-08T16:16:44.87 0.3 undecidable manual P 0 24.8529 109 0.15 72
IT.FOPC.HGZ. 2021-04-08T16:16:44.21 0.3 undecidable manual P 150 21.9669 111 0.04 74
IV.ASSB.HHZ. 2021-04-08T16:16:44.99 0.6 undecidable manual S 147 13.1757 123 0.09 50
IV.FOSV.HNZ. 2021-04-08T16:16:44.42 0.3 undecidable manual P 42 22.9548 110 0.06 73
IV.ATCC.EHZ. 2021-04-08T16:16:43.63 0.6 undecidable manual S 50 7.4814 139 0.26 48
IV.MURB.HNZ. 2021-04-08T16:16:43.07 0.3 undecidable manual P 345 13.875 121 0.36 70
IV.ASSB.HHZ. 2021-04-08T16:16:42.64 0.1 negative manual P 147 13.1757 123 0.05 100
IV.ATCC.EHZ. 2021-04-08T16:16:41.88 1.0 undecidable manual P 50 7.4814 139 0.17 25
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ATCC.EHN. ML:2.6 0.006125434 1.7056 AML other m 2021-04-08T16:16:43.13
IV.ATCC.EHE. ML:2.5 0.0053867080000000005 1.7056 AML other m 2021-04-08T16:16:43.14
IV.ASSB.HHE. ML:1.9 0.00090058205 0.1408 AML other m 2021-04-08T16:16:45.65
IV.ASSB.HHN. ML:2.0 0.00104502235 0.1024 AML other m 2021-04-08T16:16:45.40
IV.MOMA.HHN. ML:1.9 0.0002875124 0.3456 AML other m 2021-04-08T16:16:53.06
IV.MOMA.HNN. ML:1.9 0.0002895 0.3 AML other m 2021-04-08T16:16:53.23
IV.MOMA.HHE. ML:2.1 0.0004453519 0.2176 AML other m 2021-04-08T16:16:54.63
IV.MOMA.HNE. ML:2.1 0.00044427925000000004 0.2176 AML other m 2021-04-08T16:16:54.64
IV.MGAB.HHN. ML:2.4 0.0006995 0.24 AML other m 2021-04-08T16:16:56.00
IV.MGAB.HNN. ML:2.3 0.0006230142499999999 0.2432 AML other m 2021-04-08T16:16:56.12
IV.MGAB.HHE. ML:2.3 0.0005945 0.26 AML other m 2021-04-08T16:16:56.63
IV.MGAB.HNE. ML:2.2 0.0005297394 0.256 AML other m 2021-04-08T16:16:56.63
IV.CAFI.HNN. ML:2.0 0.00026878693500000003 0.1536 AML other m 2021-04-08T16:16:57.93
IV.CAFI.HHN. ML:1.9 0.00017310275 0.1408 AML other m 2021-04-08T16:16:57.92
IV.CAFI.HHE. ML:2.1 0.00032799999999999995 0.14 AML other m 2021-04-08T16:16:58.31
IV.CAFI.HNE. ML:2.1 0.00029091925000000003 0.1152 AML other m 2021-04-08T16:16:58.31
IV.GAVE.HNE. ML:1.9 0.00018221400000000001 0.256 AML other m 2021-04-08T16:17:00.05
IV.SACS.HNN. ML:2.2 0.00033918519999999995 0.384 AML other m 2021-04-08T16:17:00.74
IV.SACS.HHN. ML:2.2 0.0003265 0.36 AML other m 2021-04-08T16:17:00.93
IV.SACS.HHE. ML:1.9 0.00014700000000000002 0.28 AML other m 2021-04-08T16:17:01.10
IV.PARC.HHN. ML:2.0 0.0001965 0.42 AML other m 2021-04-08T16:17:02.59
IV.SACS.HNE. ML:1.9 0.000166057 0.448 AML other m 2021-04-08T16:17:03.75
IV.PARC.HHE. ML:2.2 0.0002935 0.4 AML other m 2021-04-08T16:17:04.28
IV.GAVE.EHN. ML:1.8 0.000130603635 0.2304 AML other m 2021-04-08T16:17:00.20
IV.GAVE.EHE. ML:2.0 0.0002455 0.94 AML other m 2021-04-08T16:17:05.24
IV.PE3.EHN. ML:2.7 0.0009854502 0.4992 AML other m 2021-04-08T16:17:02.67
IV.PE3.EHE. ML:2.7 0.00095889515 0.384 AML other m 2021-04-08T16:17:02.98
IV.TERO.HHN. ML:1.8 0.00005740764 0.576 AML other m 2021-04-08T16:17:20.40
IV.TERO.HHE. ML:1.7 0.000045831805000000004 0.5376 AML other m 2021-04-08T16:17:18.36
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