Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 21-04-2021 and time 04:38:05 (Italy) in region 4 km NE Borgorose (RI)

A magnitude ML 1.1 earthquake occured in region: 4 km NE Borgorose (RI), on

  • 21-04-2021 02:38:05 (UTC)
  • 21-04-2021 04:38:05 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.2260, 13.2530 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
Borgorose RI 4 4591 4591
Tornimparte AQ 8 3187 7778
Pescorocchiano RI 9 2075 9853
Lucoli AQ 10 1011 10864
Fiamignano RI 11 1413 12277
Sante Marie AQ 14 1166 13443
Scoppito AQ 16 3727 17170
Marcetelli RI 17 89 17259
Nespolo RI 17 246 17505
Petrella Salto RI 17 1197 18702
Massa d'Albe AQ 17 1476 20178
Tagliacozzo AQ 17 6889 27067
Magliano de' Marsi AQ 17 3690 30757
L'Aquila AQ 19 69753 100510
Collegiove RI 19 213 100723
Varco Sabino RI 19 187 100910
Scurcola Marsicana AQ 19 2824 103734
Ocre AQ 19 1167 104901
Collalto Sabino RI 19 442 105343
Rocca di Cambio AQ 20 533 105876
Carsoli AQ 20 5396 111272

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km SW of L'Aquila (69753 inhabitants)
47 Km NE of Tivoli (56533 inhabitants)
50 Km NE of Guidonia Montecelio (88673 inhabitants)
61 Km SW of Teramo (54892 inhabitants)
62 Km SE of Terni (111501 inhabitants)
72 Km NE of Velletri (53303 inhabitants)
73 Km NE of Roma (2864731 inhabitants)
77 Km W of Chieti (51815 inhabitants)
81 Km W of Montesilvano (53738 inhabitants)
83 Km W of Pescara (121014 inhabitants)
86 Km NE of Aprilia (73446 inhabitants)
88 Km NE of Pomezia (62966 inhabitants)
89 Km NE of Latina (125985 inhabitants)
93 Km SE of Foligno (57155 inhabitants)
97 Km E of Viterbo (67173 inhabitants)
98 Km NE of Fiumicino (78395 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 1.1 2021-04-21
02:38:05		 42.2257 13.2527 10 2021-07-12
16:55:09		 Bollettino Sismico Italiano INGV 89765031
Reviewed
Rev100 		ML 1.1 2021-04-21
02:38:05		 42.2272 13.2472 10 2021-04-21
02:43:42		 Sala Sismica INGV-Roma 89314731
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-21 02:38:05 ± 0.07
Latitude 42.2257 ± 0.0036
Longitude 13.2527 ± 0.0061
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 89765031

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 421
Semi-minor axis of confidence ellipse (meter) 344
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 284
Circular confidence region, given by single value of horizontal uncertainty (meter) 420.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 64
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 29
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.10882
Epicentral distance of station farthest from the epicenter (degree) 0.61604
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 16
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 20
Type of magnitude ML
Reference to an origin 89765031
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-04 13:51:03

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 20
Type of magnitude ML
Reference to an origin 89314731
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-21 02:43:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.NRCA.HHZ. 2021-04-21T02:38:26.67 0.6 undecidable manual S 351 68.376 50 0.29 43
IV.SMA1.EHZ. 2021-04-21T02:38:21.24 0.3 undecidable manual S 9 45.4212 50 0.99 53
IV.LNSS.HNZ. 2021-04-21T02:38:20.20 0.6 undecidable manual S 337 45.3213 50 -0.03 48
IV.T0110.HHZ. 2021-04-21T02:38:20.35 0.3 undecidable manual S 89 43.0236 50 0.74 59
IV.CERT.HHZ. 2021-04-21T02:38:18.22 0.3 undecidable manual S 216 37.9287 50 -0.04 72
IV.NRCA.HHZ. 2021-04-21T02:38:17.60 0.1 undecidable manual P 351 68.376 50 0.04 91
IV.GIGS.HHE. 2021-04-21T02:38:17.53 0.3 undecidable manual S 46 36.4413 50 -0.32 68
IV.CAMP.HHE. 2021-04-21T02:38:17.60 0.3 undecidable manual S 20 36.741 50 -0.33 68
IV.RM33.EHZ. 2021-04-21T02:38:16.33 0.3 undecidable manual S 354 31.5462 50 -0.23 70
IV.FAGN.HHZ. 2021-04-21T02:38:15.33 0.3 undecidable manual S 81 27.5502 50 -0.15 72
IV.TERO.HHZ. 2021-04-21T02:38:14.95 0.1 undecidable manual P 33 52.6029 50 -0.18 91
IV.SMA1.EHZ. 2021-04-21T02:38:14.58 0.1 undecidable manual P 9 45.4212 50 0.56 84
IV.PTQR.HHZ. 2021-04-21T02:38:14.64 0.3 undecidable manual S 152 25.6521 50 -0.34 69
IV.MTCE.HHZ. 2021-04-21T02:38:14.26 0.1 undecidable manual P 242 47.619 50 -0.11 93
IV.T1299.HNN. 2021-04-21T02:38:14.06 0.1 undecidable manual P 3 45.4212 50 0.04 95
IT.CSO1.HGZ. 2021-04-21T02:38:13.19 0.3 undecidable manual S 224 19.3695 118 0.05 74
IV.T0110.HHZ. 2021-04-21T02:38:13.86 0.1 undecidable manual P 89 43.0236 50 0.2 92
IV.LNSS.HNZ. 2021-04-21T02:38:13.81 0.1 undecidable manual P 337 45.3213 50 -0.2 92
IV.CERT.HHZ. 2021-04-21T02:38:12.81 0.1 undecidable manual P 216 37.9287 50 -0.06 96
IV.CAMP.HHE. 2021-04-21T02:38:12.60 0.1 undecidable manual P 20 36.741 50 -0.08 95
MN.AQU.HHE. 2021-04-21T02:38:12.80 0.3 undecidable manual S 41 18.9699 119 -0.21 72
IV.GIGS.HHE. 2021-04-21T02:38:12.51 0.1 undecidable manual P 46 36.4413 50 -0.13 95
IV.FAGN.HHZ. 2021-04-21T02:38:11.21 0.1 undecidable manual P 81 27.5502 50 -0.06 97
IV.RM33.EHZ. 2021-04-21T02:38:11.69 0.1 undecidable manual P 354 31.5462 50 -0.2 94
IV.PTQR.HHZ. 2021-04-21T02:38:10.99 0.1 undecidable manual P 152 25.6521 50 0.01 99
IV.FIAM.HHZ. 2021-04-21T02:38:10.81 0.3 undecidable manual S 293 12.0768 131 -0.23 72
IT.CSO1.HGZ. 2021-04-21T02:38:10.19 0.1 undecidable manual P 224 19.3695 118 0.27 95
MN.AQU.HHE. 2021-04-21T02:38:09.85 0.1 undecidable manual P 41 18.9699 119 0 100
IV.FIAM.HHZ. 2021-04-21T02:38:08.89 0.1 positive manual P 293 12.0768 131 0.18 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FIAM.HHE. ML:1.0 0.0001003 1.1 AML other m 2021-04-21T02:38:10.98
IV.FIAM.HHN. ML:1.2 0.0001525 0.4 AML other m 2021-04-21T02:38:11.30
IV.PTQR.HHN. ML:0.9 0.0000461 0.2 AML other m 2021-04-21T02:38:14.76
IV.PTQR.HHE. ML:1.1 0.00006254999999999999 1.32 AML other m 2021-04-21T02:38:15.68
IV.FAGN.HHN. ML:1.5 0.00017749999999999998 0.42 AML other m 2021-04-21T02:38:16.74
IV.RM33.EHN. ML:1.0 0.00004475 0.88 AML other m 2021-04-21T02:38:17.13
IV.FAGN.HHE. ML:1.6 0.000215 1.12 AML other m 2021-04-21T02:38:17.89
IV.RM33.EHE. ML:1.2 0.00006565 0.32 AML other m 2021-04-21T02:38:19.53
IV.CERT.HHN. ML:1.0 0.0000337 1.3 AML other m 2021-04-21T02:38:20.10
IV.CERT.HHE. ML:0.7 0.00001865 0.54 AML other m 2021-04-21T02:38:20.40
IV.T0110.HHN. ML:1.4 0.00006805 0.32 AML other m 2021-04-21T02:38:20.49
IV.T0110.HHE. ML:1.3 0.00006285000000000001 0.32 AML other m 2021-04-21T02:38:20.55
IV.SMA1.EHN. ML:1.1 0.000041349999999999995 1.66 AML other m 2021-04-21T02:38:22.13
IV.SMA1.EHE. ML:1.4 0.00007159999999999999 1.62 AML other m 2021-04-21T02:38:22.96
IV.TERO.HHN. ML:0.8 0.000014499999999999998 0.34 AML other m 2021-04-21T02:38:24.39
IV.MTCE.HHE. ML:0.9 0.000021400000000000002 0.52 AML other m 2021-04-21T02:38:24.85
IV.MTCE.HHN. ML:0.9 0.00001915 0.24 AML other m 2021-04-21T02:38:24.81
IV.TERO.HHE. ML:0.8 0.00001265 0.44 AML other m 2021-04-21T02:38:26.73
IV.NRCA.HHE. ML:1.2 0.000026 1.54 AML other m 2021-04-21T02:38:29.85
IV.NRCA.HHN. ML:1.1 0.000019799999999999997 0.14 AML other m 2021-04-21T02:38:29.52
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