Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 21-10-2021 and time 19:38:05 (UTC) in region 4 km NE Tagliacozzo (AQ)

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

  • 21-10-2021 19:38:05 (UTC)
  • 21-10-2021 21:38:05 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.0960, 13.2830 at 10 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Tagliacozzo AQ 4 6889 6889
Scurcola Marsicana AQ 6 2824 9713
Sante Marie AQ 7 1166 10879
Magliano de' Marsi AQ 7 3690 14569
Massa d'Albe AQ 9 1476 16045
Cappadocia AQ 10 528 16573
Borgorose RI 12 4591 21164
Castellafiume AQ 13 1106 22270
Avezzano AQ 14 42515 64785
Pereto AQ 16 682 65467
Pescorocchiano RI 17 2075 67542
Carsoli AQ 17 5396 72938
Camerata Nuova RM 17 447 73385
Capistrello AQ 17 5252 78637
Nespolo RI 19 246 78883
Vallepietra RM 19 283 79166
Rocca di Botte AQ 19 856 80022
Collalto Sabino RI 20 442 80464
Ovindoli AQ 20 1227 81691

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km SW of L'Aquila (69753 inhabitants)
43 Km E of Tivoli (56533 inhabitants)
47 Km E of Guidonia Montecelio (88673 inhabitants)
62 Km NE of Velletri (53303 inhabitants)
70 Km E of Roma (2864731 inhabitants)
72 Km SW of Teramo (54892 inhabitants)
74 Km SE of Terni (111501 inhabitants)
77 Km NE of Latina (125985 inhabitants)
77 Km NE of Aprilia (73446 inhabitants)
78 Km W of Chieti (51815 inhabitants)
80 Km NE of Pomezia (62966 inhabitants)
85 Km SW of Montesilvano (53738 inhabitants)
87 Km W of Pescara (121014 inhabitants)
90 Km NE of Anzio (54211 inhabitants)
94 Km E 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
Reviewed
Rev100 		ML 1.1 2021-10-21
19:38:05		 42.0963 13.2832 10 2021-10-21
21:08:44		 Sala Sismica INGV-Roma 96857361
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-21 19:38:05 ± 0.08
Latitude 42.0963 ± 0.0045
Longitude 13.2832 ± 0.0061
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96857361

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 494
Semi-minor axis of confidence ellipse (meter) 334
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 36
Circular confidence region, given by single value of horizontal uncertainty (meter) 490.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 87
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.11421
Epicentral distance of station farthest from the epicenter (degree) 0.33904
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 96857361
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-21 21:08:44
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VVLD.HHZ. 2021-10-21T19:38:18.44 0.6 undecidable manual S 132 37.629 50 0.31 48
IV.FAGN.HHZ. 2021-10-21T19:38:16.36 0.3 undecidable manual S 53 31.0467 50 0 78
IV.CERT.HHZ. 2021-10-21T19:38:15.91 0.3 undecidable manual S 237 29.748 50 -0.11 77
IV.FIAM.HHZ. 2021-10-21T19:38:14.32 0.1 undecidable manual S 324 23.4543 112 0.26 100
IV.GUAR.HHZ. 2021-10-21T19:38:12.08 0.3 undecidable manual P 176 33.5442 50 0.01 78
IV.VVLD.HHZ. 2021-10-21T19:38:12.91 0.6 positive manual P 132 37.629 50 0.21 49
IV.FAGN.HHZ. 2021-10-21T19:38:11.18 0.6 negative manual P 53 31.0467 50 -0.5 47
IV.CERT.HHZ. 2021-10-21T19:38:11.49 0.6 negative manual P 237 29.748 50 0.01 52
MN.AQU.HNZ. 2021-10-21T19:38:11.67 0.6 undecidable manual P 19 30.2475 50 0.11 51
IV.PTQR.HHZ. 2021-10-21T19:38:10.70 0.3 undecidable manual S 130 12.6762 127 -0.1 79
IV.FIAM.HHZ. 2021-10-21T19:38:10.02 0.3 undecidable manual P 324 23.4543 112 -0.33 74
IV.PTQR.HHZ. 2021-10-21T19:38:08.68 1.0 undecidable manual P 130 12.6762 127 0.21 26
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PTQR.HHN. ML:1.1 0.000134 1.42 AML other m 2021-10-21T19:38:11.99
IV.PTQR.HHE. ML:1.2 0.00018099999999999998 0.38 AML other m 2021-10-21T19:38:12.76
IV.FIAM.HHE. ML:0.8 0.00004095 0.74 AML other m 2021-10-21T19:38:17.52
IV.VVLD.HHE. ML:1.2 0.000055499999999999994 0.7 AML other m 2021-10-21T19:38:18.17
IV.FAGN.HHE. ML:1.4 0.000127 0.34 AML other m 2021-10-21T19:38:18.50
IV.FIAM.HHN. ML:0.8 0.00004045 1.62 AML other m 2021-10-21T19:38:20.06
IV.FAGN.HHN. ML:1.4 0.00012020000000000001 0.48 AML other m 2021-10-21T19:38:21.04
IV.VVLD.HHN. ML:1.0 0.00003835 0.44 AML other m 2021-10-21T19:38:28.34
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