Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.7 on date 21-04-2021 and time 17:33:47 (UTC) in region 4 km SE Vallo di Nera (PG)

A magnitude ML 0.7 earthquake occured in region: 4 km SE Vallo di Nera (PG), on

  • 21-04-2021 17:33:47 (UTC)
  • 21-04-2021 19:33:47 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7490, 12.9030 at 10 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
Vallo di Nera PG 4 364 364
Poggiodomo PG 5 117 481
Sant'Anatolia di Narco PG 6 564 1045
Scheggino PG 7 461 1506
Cerreto di Spoleto PG 8 1075 2581
Cascia PG 10 3217 5798
Monteleone di Spoleto PG 12 599 6397
Campello sul Clitunno PG 13 2442 8839
Spoleto PG 14 38218 47057
Sellano PG 16 1079 48136
Norcia PG 16 4957 53093
Ferentillo TR 17 1913 55006
Preci PG 18 724 55730
Polino TR 19 233 55963
Trevi PG 19 8469 64432

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km SE of Foligno (57155 inhabitants)
30 Km NE of Terni (111501 inhabitants)
58 Km SE of Perugia (166134 inhabitants)
60 Km NW of L'Aquila (69753 inhabitants)
66 Km W of Teramo (54892 inhabitants)
75 Km NE of Viterbo (67173 inhabitants)
84 Km N of Guidonia Montecelio (88673 inhabitants)
88 Km N of Tivoli (56533 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 0.7 2021-04-21
17:33:47		 42.7488 12.9033 10 2021-07-12
16:55:12		 Bollettino Sismico Italiano INGV 90455601
Reviewed
Rev100 		ML 0.7 2021-04-21
17:33:47		 42.7493 12.9082 10 2021-04-21
17:43:53		 Sala Sismica INGV-Roma 89336181
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-21 17:33:47 ± 0.08
Latitude 42.7488 ± 0.0045
Longitude 12.9033 ± 0.0073
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 90455601

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 611
Semi-minor axis of confidence ellipse (meter) 394
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 244
Circular confidence region, given by single value of horizontal uncertainty (meter) 610.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 142
Number of associated phases, regardless of their use for origin computation 38
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.34354
Number of stations at which the event was observed 26
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:0.7

Field Value
Value 0.7
Uncertainty 0.3
Num. used stations 13
Type of magnitude ML
Reference to an origin 90455601
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-24 15:30:02

ML:0.7

Field Value
Value 0.7
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 89336181
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-21 17:43:53
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MPNC.HHZ. 2021-04-21T17:35:02.39 3.0 undecidable manual Pg 12.28 0
MN.TRI.HHZ. 2021-04-21T17:34:59.24 3.0 undecidable manual Sn -2.56 0
GU.BHB.HHZ. 2021-04-21T17:34:56.76 3.0 undecidable manual Sn -4.42 0
IV.VOBA.EHZ. 2021-04-21T17:34:47.85 3.0 undecidable manual Sn 0.41 0
IV.SARZ.HHZ. 2021-04-21T17:34:46.65 3.0 undecidable manual Sg 5.87 0
IV.CADC.HNZ. 2021-04-21T17:34:44.58 3.0 undecidable manual Sn 0.27 0
MN.TRI.HHZ. 2021-04-21T17:34:37.28 3.0 undecidable manual Pg 16.1 0
IV.SBPO.HNZ. 2021-04-21T17:34:32.64 3.0 undecidable manual Sn 0.37 0
IV.GIUL.HHZ. 2021-04-21T17:34:28.19 3.0 undecidable manual Sg 3.84 0
IV.FERS.EHZ. 2021-04-21T17:34:28.70 3.0 undecidable manual Sn -0.37 0
IV.MSSA.HHZ. 2021-04-21T17:34:23.02 3.0 undecidable manual Sn -0.69 0
IX.MNT3.HHZ.02 2021-04-21T17:34:21.34 3.0 undecidable manual Pn 0.69 0
IV.MMO1.EHZ. 2021-04-21T17:34:15.09 3.0 undecidable manual Sn -0.63 0
IV.SARZ.HHZ. 2021-04-21T17:34:13.80 3.0 negative manual Pn 4.43 0
IV.VVLD.HHZ. 2021-04-21T17:34:11.21 3.0 positive manual Pg 10.11 0
IV.FIR.HHZ. 2021-04-21T17:34:08.44 3.0 undecidable manual Sg 7.25 0
IV.VOBA.EHZ. 2021-04-21T17:34:07.39 3.0 negative manual Pn -5.72 0
IV.ASSB.HHZ. 2021-04-21T17:34:00.65 0.3 undecidable manual S 329 38.1285 50 -0.03 75
IV.FDMO.HHZ. 2021-04-21T17:34:00.00 0.3 undecidable manual S 25 35.2425 50 0.11 74
IV.RM33.HNN. 2021-04-21T17:34:00.44 0.1 undecidable manual S 136 36.8298 50 0.13 98
IV.MC2.EHZ. 2021-04-21T17:33:58.73 0.3 undecidable manual S 52 29.4483 50 0.39 71
IV.CESI.HHZ. 2021-04-21T17:33:58.18 0.1 undecidable manual S 0 28.3494 50 0.11 100
IV.MSSA.HHZ. 2021-04-21T17:33:58.45 3.0 undecidable manual Pn -1.33 0
IV.ASSB.HHZ. 2021-04-21T17:33:55.07 0.1 undecidable manual P 329 38.1285 50 -0.19 97
IV.LNSS.HHZ. 2021-04-21T17:33:55.37 0.1 undecidable manual S 145 19.6692 118 -0.19 100
IV.NRCA.HHZ. 2021-04-21T17:33:55.44 0.3 undecidable manual S 61 19.5693 118 -0.09 77
IV.FDMO.HHZ. 2021-04-21T17:33:54.75 0.1 undecidable manual P 25 35.2425 50 -0.05 100
IV.RM33.HNN. 2021-04-21T17:33:54.98 0.1 undecidable manual P 136 36.8298 50 -0.06 99
IV.MC2.EHZ. 2021-04-21T17:33:53.24 0.3 undecidable manual P 52 29.4483 50 -0.67 65
IV.CESI.HHZ. 2021-04-21T17:33:53.73 0.3 undecidable manual P 0 28.3494 50 -0.02 76
IV.LNSS.HHZ. 2021-04-21T17:33:52.32 1.0 negative manual P 145 19.6692 118 0.01 26
IV.NRCA.HHZ. 2021-04-21T17:33:52.37 0.3 negative manual P 61 19.5693 118 0.09 77
IV.GAVE.EHZ. 2021-04-21T17:33:52.11 0.3 undecidable manual S 187 6.2937 148 0.06 79
IV.ARRO.EHZ. 2021-04-21T17:33:50.28 3.0 positive manual P 0.52 0
IV.GAVE.EHZ. 2021-04-21T17:33:50.59 0.1 negative manual P 187 6.2937 148 0.31 100
IV.SEI.HHZ. 2021-04-21T17:33:48.66 3.0 positive manual Pn -2.37 0
IV.RIBO.EHZ.01 2021-04-21T17:33:43.77 3.0 undecidable manual S 0.95 0
IV.MCIV.CHZ. 2021-04-21T17:33:42.90 3.0 undecidable manual S -3.66 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHN. ML:1.7 0.0008025 0.1 AML other m 2021-04-21T17:33:52.28
IV.GAVE.EHE. ML:1.5 0.000477 0.14 AML other m 2021-04-21T17:33:52.41
IV.LNSS.HHN. ML:0.8 0.0000431 0.12 AML other m 2021-04-21T17:33:56.04
IV.NRCA.HHN. ML:0.8 0.0000445 0.12 AML other m 2021-04-21T17:33:56.34
IV.NRCA.HHE. ML:0.7 0.000038150000000000006 0.14 AML other m 2021-04-21T17:33:56.58
IV.LNSS.HHE. ML:0.8 0.00004495 0.84 AML other m 2021-04-21T17:33:57.77
IV.FDMO.HHN. ML:0.6 0.000013729999999999999 0.16 AML other m 2021-04-21T17:34:00.27
IV.FDMO.HHE. ML:0.6 0.000015300000000000003 0.14 AML other m 2021-04-21T17:34:00.31
IV.ASSB.HHE. ML:0.6 0.00001535 0.6 AML other m 2021-04-21T17:34:01.66
IV.ASSB.HHN. ML:0.4 0.000012195000000000001 0.58 AML other m 2021-04-21T17:34:02.28
IV.GAVE.HNE. ML:1.6 0.00055964945 0.128 AML other m 2021-04-21T17:33:52.47
IV.CESI.HHE. ML:0.5 0.000014448751499999999 1.28 AML other m 2021-04-21T17:33:59.08
IV.CESI.HHN. ML:0.5 0.000016062645 0.2176 AML other m 2021-04-21T17:33:58.26
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