Earthquake with magnitude of ML 0.9 on date 16-04-2021 and time 23:22:05 (UTC) in region 4 km SE Antrodoco (RI)

A magnitude ML 0.9 earthquake occured in region: 4 km SE Antrodoco (RI), on

  • 16-04-2021 23:22:05 (UTC)
  • 17-04-2021 01:22:05 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.386, 13.109 at 11 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
Antrodoco RI 4 2588 2588
Borgo Velino RI 5 972 3560
Castel Sant'Angelo RI 7 1308 4868
Micigliano RI 9 127 4995
Petrella Salto RI 11 1197 6192
Concerviano RI 12 291 6483
Scoppito AQ 12 3727 10210
Cagnano Amiterno AQ 13 1369 11579
Cittaducale RI 13 6828 18407
Fiamignano RI 14 1413 19820
Borbona RI 14 617 20437
Posta RI 15 694 21131
Barete AQ 16 737 21868
Pizzoli AQ 16 4326 26194
Longone Sabino RI 17 597 26791
Varco Sabino RI 18 187 26978
Marcetelli RI 18 89 27067
Tornimparte AQ 19 3187 30254
Montereale AQ 19 2581 32835
Belmonte in Sabina RI 19 636 33471
Cantalice RI 19 2755 36226
Rocca Sinibalda RI 19 815 37041

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km W of L'Aquila (69753 inhabitants)
43 Km E of Terni (111501 inhabitants)
53 Km NE of Guidonia Montecelio (88673 inhabitants)
53 Km NE of Tivoli (56533 inhabitants)
58 Km SW of Teramo (54892 inhabitants)
72 Km SE of Foligno (57155 inhabitants)
75 Km NE of Roma (2864731 inhabitants)
82 Km NE of Velletri (53303 inhabitants)
83 Km E of Viterbo (67173 inhabitants)
87 Km W of Montesilvano (53738 inhabitants)
87 Km W of Chieti (51815 inhabitants)
91 Km W of Pescara (121014 inhabitants)
94 Km NE of Pomezia (62966 inhabitants)
96 Km NE of Aprilia (73446 inhabitants)
99 Km NE of Fiumicino (78395 inhabitants)
100 Km SE of Perugia (166134 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 0.9 2021-04-16
23:22:05
42.3863 13.1093 11 2021-07-12
16:55:08
Bollettino Sismico Italiano INGV 89595041
Reviewed
Rev100
ML 1.1 2021-04-16
23:22:05
42.3882 13.0987 11 2021-04-16
23:27:49
Sala Sismica INGV-Roma 89161721
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-16 23:22:05 ± 0.05
Latitude 42.3863 ± 0.0162
Longitude 13.1093 ± 0.0049
Depth (km) 11 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 89595041

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1780
Semi-minor axis of confidence ellipse (meter) 348
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 174
Circular confidence region, given by single value of horizontal uncertainty (meter) 1780
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 143
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.31836
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 6
Magnitudes information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.4
Num. used stations 6
Type of magnitude ML
Reference to an origin 89595041
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-14 15:51:04

ML:1.1

Field Value
Value 1.1
Uncertainty 0.8
Num. used stations 8
Type of magnitude ML
Reference to an origin 89161721
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-16 23:27:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.FIR.HHZ. 2021-04-16T23:23:15.01 3.0 undecidable manual Sg 14.13 0
IV.MNTV.EHZ. 2021-04-16T23:23:05.71 3.0 negative manual Pg 12.88 0
IV.MSSA.HHZ. 2021-04-16T23:23:01.14 3.0 undecidable manual Pn 7.65 0
IV.ILOS.HHZ. 2021-04-16T23:23:01.00 3.0 negative manual Pn -1.61 0
IV.RIBO.EHZ.01 2021-04-16T23:23:00.30 3.0 undecidable manual Sn 6.86 0
IV.PTRJ.HNZ. 2021-04-16T23:22:44.31 3.0 undecidable manual S 2.14 0
IV.ARRO.EHZ. 2021-04-16T23:22:17.41 0.6 undecidable manual S 307 0.3184 50 0.17 47
IV.T1299.HNN. 2021-04-16T23:22:16.16 0.6 undecidable manual S 27 0.2788 50 0.1 48
IV.SMA1.EHN. 2021-04-16T23:22:16.64 0.6 undecidable manual S 34 0.295 50 0.08 48
IV.LNSS.HHZ. 2021-04-16T23:22:14.47 0.3 undecidable manual S 347 0.2221 50 0.08 73
IV.RM33.EHZ. 2021-04-16T23:22:12.08 0.3 undecidable manual S 32 0.1448 124 0.09 75
IV.ARRO.EHZ. 2021-04-16T23:22:12.03 0.1 undecidable manual P 307 0.3184 50 -0.15 94
IV.SMA1.EHN. 2021-04-16T23:22:11.68 0.1 undecidable manual P 34 0.295 50 -0.11 96
IV.FIAM.HHZ. 2021-04-16T23:22:11.18 0.3 undecidable manual S 177 0.1187 129 0.02 76
IV.T1299.HNN. 2021-04-16T23:22:11.46 0.3 undecidable manual P 27 0.2788 50 -0.04 73
IV.LNSS.HHZ. 2021-04-16T23:22:10.48 0.3 undecidable manual P 347 0.2221 50 -0.06 73
IV.RM33.EHZ. 2021-04-16T23:22:09.26 0.1 undecidable manual P 32 0.1448 124 0.11 100
IV.FIAM.HHZ. 2021-04-16T23:22:08.73 0.1 undecidable manual P 177 0.1187 129 0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FIAM.HHE. ML:0.3 1.895E-5 0.82 AML other m 2021-04-16T23:22:11.80
IV.FIAM.HHN. ML:0.4 2.325E-5 0.16 AML other m 2021-04-16T23:22:11.81
IV.RM33.EHE. ML:1.1 0.000103 1.02 AML other m 2021-04-16T23:22:12.45
IV.RM33.EHN. ML:0.8 5.885E-5 0.2 AML other m 2021-04-16T23:22:12.35
IV.LNSS.HHN. ML:1.2 8.855E-5 0.5 AML other m 2021-04-16T23:22:14.93
IV.LNSS.HHE. ML:1.2 8.755E-5 1.1 AML other m 2021-04-16T23:22:15.62
IV.ILOS.HHN. ML:4.6 0.0014 1.14 AML other m 2021-04-16T23:23:08.67
IV.ILOS.HHE. ML:4.6 0.00148 1.18 AML other m 2021-04-16T23:23:08.35
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