Earthquake with magnitude of ML 1.6 on date 20-04-2021 and time 16:49:46 (Italy) in region 1 km SW Polino (TR)

A magnitude ML 1.6 earthquake occured in region: 1 km SW Polino (TR), on

  • 20-04-2021 14:49:46 (UTC)
  • 20-04-2021 16:49:46 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.578, 12.838 at 15 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Polino TR 1 233 233
Arrone TR 6 2763 2996
Morro Reatino RI 6 373 3369
Montefranco TR 6 1276 4645
Ferentillo TR 6 1913 6558
Labro RI 6 374 6932
Rivodutri RI 7 1253 8185
Poggio Bustone RI 9 2055 10240
Colli sul Velino RI 10 533 10773
Leonessa RI 11 2435 13208
Monteleone di Spoleto PG 13 599 13807
Cantalice RI 13 2755 16562
Greccio RI 15 1558 18120
Scheggino PG 15 461 18581
Terni TR 16 111501 130082
Stroncone TR 17 4917 134999
Poggiodomo PG 17 117 135116
Sant'Anatolia di Narco PG 17 564 135680
Rieti RI 19 47698 183378
Spoleto PG 19 38218 221596
Contigliano RI 19 3783 225379

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km E of Terni (111501 inhabitants)
44 Km S of Foligno (57155 inhabitants)
53 Km W of L'Aquila (69753 inhabitants)
63 Km E of Viterbo (67173 inhabitants)
65 Km N of Guidonia Montecelio (88673 inhabitants)
68 Km N of Tivoli (56533 inhabitants)
69 Km SE of Perugia (166134 inhabitants)
72 Km W of Teramo (54892 inhabitants)
81 Km NE of Roma (2864731 inhabitants)
99 Km N of Velletri (53303 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 1.6 2021-04-20
14:49:46
42.5777 12.8377 15 2021-07-12
16:55:15
Bollettino Sismico Italiano INGV 91374011
Reviewed
Rev100
ML 1.6 2021-04-20
14:49:46
42.5788 12.832 15 2021-04-20
14:54:14
Sala Sismica INGV-Roma 89296481
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-20 14:49:46 ± 0.06
Latitude 42.5777 ± 0.0027
Longitude 12.8377 ± 0.0037
Depth (km) 15 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 91374011

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 284
Semi-minor axis of confidence ellipse (meter) 153
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 58
Circular confidence region, given by single value of horizontal uncertainty (meter) 280
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 81
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 35
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) 0.05306
Epicentral distance of station farthest from the epicenter (degree) 0.58006
Number of stations at which the event was observed 18
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 20
Type of magnitude ML
Reference to an origin 91374011
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-16 07:48:10

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 24
Type of magnitude ML
Reference to an origin 89296481
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-20 14:54:14
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.TERO.HHZ. 2021-04-20T14:50:05.28 0.1 undecidable manual S 85 0.5657 94 -0.07 90
IV.ASSB.HHZ. 2021-04-20T14:50:03.19 0.3 undecidable manual S 344 0.4829 95 0.28 65
IV.FDMO.HHZ. 2021-04-20T14:50:03.25 0.3 undecidable manual S 22 0.4937 95 0.02 69
IV.MMO1.EHZ. 2021-04-20T14:50:02.95 0.3 undecidable manual S 48 0.482 95 0.07 68
IV.MC2.EHZ. 2021-04-20T14:50:01.38 0.3 undecidable manual S 38 0.4218 96 0.28 66
IV.CESI.HHZ. 2021-04-20T14:50:01.52 0.3 undecidable manual S 7 0.4299 96 0.17 67
IV.FEMA.HNZ. 2021-04-20T14:50:01.64 0.3 undecidable manual S 22 0.4146 96 0.75 57
IV.FIAM.HHZ. 2021-04-20T14:49:59.75 0.3 undecidable manual S 146 0.3723 98 0.11 69
IV.SMA1.EHZ. 2021-04-20T14:49:59.73 0.3 undecidable manual S 82 0.3696 98 0.15 68
IT.MMP1.HGZ. 2021-04-20T14:49:58.89 0.3 undecidable manual S 191 0.3345 99 0.33 66
IV.MOMA.HNZ. 2021-04-20T14:49:57.71 0.3 undecidable manual S 319 0.2995 100 0.19 69
IV.RM33.EHZ. 2021-04-20T14:49:57.54 0.3 undecidable manual S 104 0.286 101 0.41 66
IT.GNU.HGZ. 2021-04-20T14:49:57.80 0.6 undecidable manual S 319 0.2995 100 0.28 45
IV.CSP1.EHZ. 2021-04-20T14:49:57.29 0.1 undecidable manual P 28 0.5801 94 -0.17 87
IV.TERO.HHZ. 2021-04-20T14:49:56.84 0.3 undecidable manual P 85 0.5657 94 -0.38 63
IV.FDMO.HHZ. 2021-04-20T14:49:55.72 0.1 undecidable manual P 22 0.4937 95 -0.27 87
IV.ASSB.HHZ. 2021-04-20T14:49:55.75 0.1 undecidable manual P 344 0.4829 95 -0.05 91
IV.MMO1.EHZ. 2021-04-20T14:49:55.62 0.1 undecidable manual P 48 0.482 95 -0.17 89
IV.FEMA.HNZ. 2021-04-20T14:49:54.45 0.1 undecidable manual P 22 0.4146 96 -0.19 90
IV.MC2.EHZ. 2021-04-20T14:49:54.70 0.1 undecidable manual P 38 0.4218 96 -0.06 92
IV.CESX.HHZ. 2021-04-20T14:49:54.32 0.6 undecidable manual S 280 0.1871 112 0.01 49
IV.CESI.HHZ. 2021-04-20T14:49:54.76 0.1 positive manual P 7 0.4299 96 -0.14 90
IV.LNSS.HHZ. 2021-04-20T14:49:53.20 0.3 undecidable manual S 80 0.1511 119 -0.15 72
IV.SMA1.EHZ. 2021-04-20T14:49:53.87 0.1 undecidable manual P 82 0.3696 98 -0.01 94
IT.MMP1.HGZ. 2021-04-20T14:49:53.34 0.3 undecidable manual P 191 0.3345 99 0.05 70
IV.FIAM.HHZ. 2021-04-20T14:49:53.84 0.1 undecidable manual P 146 0.3723 98 -0.08 93
IT.GNU.HGZ. 2021-04-20T14:49:52.73 0.3 undecidable manual P 319 0.2995 100 0.04 71
IV.MOMA.HNZ. 2021-04-20T14:49:52.60 0.3 undecidable manual P 319 0.2995 100 -0.1 70
IV.RM33.EHZ. 2021-04-20T14:49:52.41 0.1 undecidable manual P 104 0.286 101 -0.06 95
IV.GAVE.HNZ. 2021-04-20T14:49:52.39 0.3 undecidable manual S 20 0.1214 127 -0.22 70
IV.ARRO.EHZ. 2021-04-20T14:49:51.18 0.3 undecidable manual S 272 0.0531 154 -0.12 73
IV.LNSS.HHZ. 2021-04-20T14:49:50.26 0.1 negative manual P 80 0.1511 119 -0.02 98
IV.CESX.HHZ. 2021-04-20T14:49:50.70 0.3 undecidable manual P 280 0.1871 112 -0.14 71
IV.GAVE.HNZ. 2021-04-20T14:49:49.82 0.1 undecidable manual P 20 0.1214 127 -0.04 98
IV.ARRO.EHZ. 2021-04-20T14:49:49.12 0.1 undecidable manual P 272 0.0531 154 0.01 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARRO.EHE. ML:1.6 0.00045 0.2 AML other m 2021-04-20T14:49:52.30
IV.GAVE.EHN. ML:2.1 0.00111 0.36 AML other m 2021-04-20T14:49:52.86
IV.GAVE.EHE. ML:2 0.0007595 0.16 AML other m 2021-04-20T14:49:52.77
IV.LNSS.HNN. ML:1.8 0.0005215 0.68 AML other m 2021-04-20T14:49:53.59
IV.LNSS.HHE. ML:1.9 0.0005825 0.12 AML other m 2021-04-20T14:49:53.77
IV.LNSS.HNE. ML:1.9 0.000577 0.34 AML other m 2021-04-20T14:49:53.77
IV.CESX.HHN. ML:1.6 0.000278 0.3 AML other m 2021-04-20T14:49:54.66
IV.LNSS.HHN. ML:1.8 0.0005255 0.96 AML other m 2021-04-20T14:49:54.70
IV.ARRO.EHN. ML:1.4 0.0002615 0.2 AML other m 2021-04-20T14:49:55.16
IV.CESX.HHE. ML:1.5 0.000208 0.22 AML other m 2021-04-20T14:49:55.84
IV.RM33.EHN. ML:1.4 9.68E-5 0.1 AML other m 2021-04-20T14:49:57.77
IV.RM33.EHE. ML:1.4 9.69E-5 1.72 AML other m 2021-04-20T14:49:57.98
IV.FIAM.HHE. ML:1 3.55E-5 0.16 AML other m 2021-04-20T14:50:00.34
IV.FIAM.HHN. ML:1.2 4.93E-5 0.86 AML other m 2021-04-20T14:50:00.02
IV.SMA1.EHN. ML:1.8 0.000182 0.24 AML other m 2021-04-20T14:50:00.48
IV.SMA1.EHE. ML:1.8 0.000218 0.28 AML other m 2021-04-20T14:50:00.75
IV.CESI.HHN. ML:1.6 9.41E-5 0.5 AML other m 2021-04-20T14:50:02.89
IV.CESI.HHE. ML:1.3 5.57E-5 0.6 AML other m 2021-04-20T14:50:02.98
IV.ASSB.HHE. ML:1.9 0.000178 0.42 AML other m 2021-04-20T14:50:03.71
IV.FDMO.HHE. ML:1.4 6.105E-5 0.14 AML other m 2021-04-20T14:50:04.11
IV.ASSB.HHN. ML:1.9 0.0001885 1.62 AML other m 2021-04-20T14:50:04.12
IV.FDMO.HHN. ML:1.3 4.745E-5 1.06 AML other m 2021-04-20T14:50:04.12
IV.TERO.HHE. ML:1.2 3.03E-5 0.28 AML other m 2021-04-20T14:50:06.11
IV.TERO.HHN. ML:1.4 4.56E-5 0.14 AML other m 2021-04-20T14:50:06.33
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