Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 27-09-2021 and time 11:47:14 (UTC) in region 2 km N Gioia dei Marsi (AQ)

A magnitude ML 1.6 earthquake occured in region: 2 km N Gioia dei Marsi (AQ), on

  • 27-09-2021 11:47:14 (UTC)
  • 27-09-2021 13:47:14 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.9750, 13.6960 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
Gioia dei Marsi AQ 2 1989 1989
Ortona dei Marsi AQ 4 542 2531
Ortucchio AQ 5 1860 4391
Lecce nei Marsi AQ 5 1702 6093
Pescina AQ 7 4133 10226
San Benedetto dei Marsi AQ 7 3909 14135
Bisegna AQ 8 223 14358
Anversa degli Abruzzi AQ 9 341 14699
Cocullo AQ 9 230 14929
Collarmele AQ 11 894 15823
Villalago AQ 12 568 16391
Cerchio AQ 13 1635 18026
Trasacco AQ 13 6246 24272
Villavallelonga AQ 13 919 25191
Collelongo AQ 13 1233 26424
Goriano Sicoli AQ 13 569 26993
Bugnara AQ 15 1125 28118
Aielli AQ 15 1475 29593
Prezza AQ 15 945 30538
Castel di Ieri AQ 16 303 30841
Gagliano Aterno AQ 17 254 31095
Raiano AQ 17 2815 33910
Celano AQ 17 11017 44927
Scanno AQ 17 1847 46774
Introdacqua AQ 17 2126 48900
Castelvecchio Subequo AQ 18 982 49882
Luco dei Marsi AQ 19 6079 55961
Vittorito AQ 20 873 56834
Molina Aterno AQ 20 386 57220
Pescasseroli AQ 20 2203 59423
Secinaro AQ 20 359 59782

Municipalities with at least 50000 inhabitants

An earthquake occurred to
49 Km SE of L'Aquila (69753 inhabitants)
57 Km SW of Chieti (51815 inhabitants)
69 Km SW of Pescara (121014 inhabitants)
71 Km SW of Montesilvano (53738 inhabitants)
74 Km E of Tivoli (56533 inhabitants)
76 Km S of Teramo (54892 inhabitants)
80 Km E of Guidonia Montecelio (88673 inhabitants)
83 Km E of Velletri (53303 inhabitants)
87 Km NE of Latina (125985 inhabitants)
97 Km E of Aprilia (73446 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 2021-09-27
11:47:14		 41.9747 13.6963 10 2022-03-30
13:04:11		 Bollettino Sismico Italiano INGV 96469901
Reviewed
Rev100 		ML 1.7 2021-09-27
11:47:14		 41.9918 13.6958 9 2021-09-27
12:26:55		 Sala Sismica INGV-Roma 95947021
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-27 11:47:14 ± 0.04
Latitude 41.9747 ± 0.0018
Longitude 13.6963 ± 0.0036
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 96469901

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 230
Semi-minor axis of confidence ellipse (meter) 187
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 134
Circular confidence region, given by single value of horizontal uncertainty (meter) 230.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 62
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) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.11781
Epicentral distance of station farthest from the epicenter (degree) 0.65111
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:1.7

Field Value
Value 1.7
Uncertainty 0.1
Num. used stations 8
Type of magnitude ML
Reference to an origin 95947021
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-27 12:26:55

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 96469901
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-25 07:41:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MIDA.HNZ. 2021-09-27T11:47:32.50 0.6 undecidable manual S 128 59.0964 50 -0.1 45
IV.GIUL.HHZ. 2021-09-27T11:47:32.50 0.6 undecidable manual S 219 58.8966 50 -0.06 46
IV.GIGS.HHN. 2021-09-27T11:47:31.40 0.6 undecidable manual S 349 54.0015 50 0.14 45
IV.LPEL.HHE. 2021-09-27T11:47:28.01 0.6 undecidable manual S 79 40.9257 50 0.25 45
IV.GUAR.HNN. 2021-09-27T11:47:27.00 0.3 undecidable manual S 238 37.5291 50 0.16 70
IV.FAGN.HHZ. 2021-09-27T11:47:26.11 0.6 undecidable manual S 344 33.6441 50 0.31 45
IV.TERO.HHN. 2021-09-27T11:47:26.77 0.6 undecidable manual P 354 72.2721 50 -0.04 45
IV.GIUL.HHZ. 2021-09-27T11:47:24.72 0.6 undecidable manual P 219 58.8966 50 -0.03 46
IV.POFI.HNE. 2021-09-27T11:47:24.86 0.6 undecidable manual S 177 28.5492 50 0.4 45
IV.T0110.HHZ. 2021-09-27T11:47:24.60 0.3 undecidable manual S 13 29.0487 50 0.02 73
IV.MIDA.HNZ. 2021-09-27T11:47:24.69 0.3 undecidable manual P 128 59.0964 50 -0.08 68
IV.PTQR.HHZ. 2021-09-27T11:47:23.40 0.6 undecidable manual S 282 24.9528 111 0.04 49
IV.GIGS.HHN. 2021-09-27T11:47:23.74 0.3 undecidable manual P 349 54.0015 50 -0.26 66
IV.VCEL.EHN. 2021-09-27T11:47:23.45 0.6 undecidable manual P 14 48.1185 50 0.37 44
IT.OPI.HGE. 2021-09-27T11:47:23.36 0.6 undecidable manual S 153 24.6531 112 0.1 48
IT.SULP.HGZ. 2021-09-27T11:47:22.70 0.6 undecidable manual S 57 22.6551 113 0.08 49
IV.RNI2.HNE. 2021-09-27T11:47:22.54 0.6 undecidable manual P 128 48.2184 50 -0.56 41
IV.LPEL.HHE. 2021-09-27T11:47:21.97 0.3 undecidable manual P 79 40.9257 50 -0.01 72
IV.INTR.HHZ. 2021-09-27T11:47:21.17 0.3 undecidable manual S 77 17.6712 119 0.11 73
IV.GUAR.HNN. 2021-09-27T11:47:21.47 0.1 undecidable manual P 238 37.5291 50 0.02 96
IV.FAGN.HHZ. 2021-09-27T11:47:20.69 0.3 undecidable manual P 344 33.6441 50 -0.16 70
IV.VVLD.HHZ. 2021-09-27T11:47:19.60 0.3 undecidable manual S 207 13.0758 126 -0.13 73
IV.PTQR.HHZ. 2021-09-27T11:47:19.55 0.3 undecidable manual P 282 24.9528 111 0.12 72
IT.OPI.HGE. 2021-09-27T11:47:19.53 0.3 undecidable manual P 153 24.6531 112 0.16 71
IV.POFI.HNE. 2021-09-27T11:47:19.90 0.3 undecidable manual P 177 28.5492 50 -0.17 71
IV.T0110.HHZ. 2021-09-27T11:47:19.88 0.1 positive manual P 13 29.0487 50 -0.26 92
IT.SULP.HGZ. 2021-09-27T11:47:18.67 0.6 undecidable manual P 57 22.6551 113 -0.34 46
IV.INTR.HHZ. 2021-09-27T11:47:18.24 0.1 positive manual P 77 17.6712 119 0.13 97
IV.VVLD.HHZ. 2021-09-27T11:47:17.33 0.1 negative manual P 207 13.0758 126 -0.01 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VVLD.HHN. ML:1.6 0.00046100000000000004 0.42 AML other m 2021-09-27T11:47:20.03
IV.VVLD.HNN. ML:1.6 0.0004595 1.56 AML other m 2021-09-27T11:47:20.04
IV.INTR.HNE. ML:1.7 0.00038740145000000004 0.224 AML other m 2021-09-27T11:47:21.47
IV.INTR.HHE. ML:1.7 0.00039449999999999994 0.2 AML other m 2021-09-27T11:47:21.48
IV.VVLD.HNE. ML:1.5 0.0003373847 0.6336 AML other m 2021-09-27T11:47:21.84
IV.VVLD.HHE. ML:1.5 0.0003298991 0.6208 AML other m 2021-09-27T11:47:21.84
IV.INTR.HHN. ML:2.0 0.0007824241 0.1984 AML other m 2021-09-27T11:47:21.92
IV.INTR.HNN. ML:2.0 0.00075119555 0.1984 AML other m 2021-09-27T11:47:21.92
IV.PTQR.HHN. ML:1.1 0.0000712 0.86 AML other m 2021-09-27T11:47:23.36
IV.PTQR.HHE. ML:1.3 0.00011135000000000001 1.62 AML other m 2021-09-27T11:47:25.02
IV.T0110.HHN. ML:1.6 0.0001955 0.32 AML other m 2021-09-27T11:47:26.49
IV.T0110.HHE. ML:1.5 0.00016875119999999998 0.2816 AML other m 2021-09-27T11:47:28.02
IV.VCEL.EHE. ML:1.5 0.00008092917 0.3648 AML other m 2021-09-27T11:47:33.20
IV.VCEL.EHN. ML:1.4 0.00007139523 1.0816 AML other m 2021-09-27T11:47:40.38
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