Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 21-09-2021 and time 07:56:24 (Italy) in region 5 km NW L'Aquila (AQ)

A magnitude ML 1.4 earthquake occured in region: 5 km NW L'Aquila (AQ), on

  • 21-09-2021 05:56:24 (UTC)
  • 21-09-2021 07:56:24 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.3880, 13.3630 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
L'Aquila AQ 5 69753 69753
Pizzoli AQ 8 4326 74079
Scoppito AQ 9 3727 77806
Barete AQ 10 737 78543
Lucoli AQ 11 1011 79554
Tornimparte AQ 12 3187 82741
Cagnano Amiterno AQ 14 1369 84110
Fossa AQ 15 721 84831
Ocre AQ 15 1167 85998
Capitignano AQ 16 665 86663
Poggio Picenze AQ 17 1136 87799
Sant'Eusanio Forconese AQ 17 394 88193
Montereale AQ 18 2581 90774
Campotosto AQ 19 542 91316
Villa Sant'Angelo AQ 20 424 91740
San Demetrio ne' Vestini AQ 20 1854 93594
Rocca di Cambio AQ 20 533 94127

Municipalities with at least 50000 inhabitants

An earthquake occurred to
5 Km NW of L'Aquila (69753 inhabitants)
41 Km SW of Teramo (54892 inhabitants)
62 Km E of Terni (111501 inhabitants)
66 Km W of Montesilvano (53738 inhabitants)
66 Km NE of Tivoli (56533 inhabitants)
66 Km W of Chieti (51815 inhabitants)
68 Km NE of Guidonia Montecelio (88673 inhabitants)
70 Km W of Pescara (121014 inhabitants)
83 Km SE of Foligno (57155 inhabitants)
91 Km NE of Roma (2864731 inhabitants)
92 Km NE 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 1.4 2021-09-21
05:56:24		 42.3885 13.3628 10 2022-03-30
13:04:25		 Bollettino Sismico Italiano INGV 99280431
Reviewed
Rev100 		ML 1.4 2021-09-21
05:56:24		 42.3785 13.382 12 2021-09-21
06:43:03		 Sala Sismica INGV-Roma 95686551
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-21 05:56:24 ± 0.07
Latitude 42.3885 ± 0.0045
Longitude 13.3628 ± 0.0061
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 99280431

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 496
Semi-minor axis of confidence ellipse (meter) 412
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 248
Circular confidence region, given by single value of horizontal uncertainty (meter) 500.0
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 24
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.04676
Epicentral distance of station farthest from the epicenter (degree) 0.95958
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.1
Num. used stations 11
Type of magnitude ML
Reference to an origin 99280431
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-03 11:21:38

ML:1.4

Field Value
Value 1.4
Uncertainty 0.1
Num. used stations 11
Type of magnitude ML
Reference to an origin 95686551
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-21 06:43:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EL6.EHZ. 2021-09-21T05:56:42.19 0.6 undecidable manual P 349 106.5156 50 0.08 44
IV.NRCA.HHZ. 2021-09-21T05:56:41.18 0.6 undecidable manual S 338 53.4021 50 0.12 48
IV.CSP1.EHZ. 2021-09-21T05:56:37.27 0.6 undecidable manual P 351 79.0653 50 -0.61 40
IV.T0110.HHZ. 2021-09-21T05:56:37.48 0.6 undecidable manual S 117 38.2284 50 0.46 46
IV.T1299.EHE. 2021-09-21T05:56:34.27 0.6 undecidable manual S 346 28.0497 50 -0.03 51
IV.TERO.HHZ. 2021-09-21T05:56:34.88 0.3 undecidable manual S 37 32.6451 50 -0.64 65
IV.SMA1.EHE. 2021-09-21T05:56:34.35 0.6 undecidable manual S 355 26.9508 50 0.34 48
IV.NRCA.HHZ. 2021-09-21T05:56:33.78 0.3 undecidable manual P 338 53.4021 50 -0.14 72
IV.FAGN.HHZ. 2021-09-21T05:56:32.89 0.6 undecidable manual S 127 22.6551 114 0.12 51
IV.FIAM.HNE. 2021-09-21T05:56:32.81 0.3 undecidable manual S 237 24.1536 113 -0.44 71
IV.PTQR.HHZ. 2021-09-21T05:56:32.04 0.3 undecidable manual P 176 40.8258 50 0.06 75
IV.T0110.HHZ. 2021-09-21T05:56:31.98 0.6 undecidable manual P 117 38.2284 50 0.4 47
IV.CAMP.HHE. 2021-09-21T05:56:31.01 0.3 undecidable manual S 13 16.7721 121 0.05 78
IV.GIGS.HHE. 2021-09-21T05:56:31.12 0.3 undecidable manual S 67 18.6702 119 -0.4 72
IV.SMA1.EHE. 2021-09-21T05:56:30.07 0.6 undecidable manual P 355 26.9508 50 0.23 49
IV.T1299.EHE. 2021-09-21T05:56:30.05 0.3 undecidable manual P 346 28.0497 50 0.04 77
IV.TERO.HHZ. 2021-09-21T05:56:30.57 0.3 undecidable manual P 37 32.6451 50 -0.15 74
IV.FIAM.HNE. 2021-09-21T05:56:29.28 0.3 undecidable manual P 237 24.1536 113 -0.13 76
IV.RM33.EHZ. 2021-09-21T05:56:28.61 0.1 undecidable manual P 318 18.0708 119 0.3 98
IV.CAMP.HHE. 2021-09-21T05:56:28.32 0.1 undecidable manual P 13 16.7721 121 0.24 100
IV.FAGN.HHZ. 2021-09-21T05:56:28.77 0.6 undecidable manual P 127 22.6551 114 -0.36 48
IV.GIGS.HHE. 2021-09-21T05:56:28.45 0.3 undecidable manual P 67 18.6702 119 0.04 78
MN.AQU.HHN. 2021-09-21T05:56:27.99 0.3 undecidable manual S 138 5.1948 153 -0.12 78
MN.AQU.HHN. 2021-09-21T05:56:26.78 0.1 undecidable manual P 138 5.1948 153 0.34 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RM33.HNN. ML:1.4 0.00019025775 0.2304 AML other m 2021-09-21T05:56:32.44
IV.RM33.EHN. ML:1.3 0.00016924645 0.2176 AML other m 2021-09-21T05:56:32.45
IV.RM33.EHE. ML:1.4 0.00019835145 0.1408 AML other m 2021-09-21T05:56:32.51
IV.RM33.HNE. ML:1.4 0.000207472715 0.1408 AML other m 2021-09-21T05:56:32.51
IV.FAGN.HHN. ML:1.5 0.00022000000000000003 0.26 AML other m 2021-09-21T05:56:33.73
IV.TERO.HHN. ML:1.3 0.000090988275 0.0576 AML other m 2021-09-21T05:56:35.09
IV.FAGN.HHE. ML:1.5 0.00019613229999999998 0.2784 AML other m 2021-09-21T05:56:35.59
IV.TERO.HNE. ML:1.3 0.000092007075 0.1504 AML other m 2021-09-21T05:56:37.12
IV.NRCA.HHN. ML:1.4 0.000060950000000000004 0.12 AML other m 2021-09-21T05:56:42.83
IV.NRCA.HHE. ML:1.4 0.000064941805 0.0992 AML other m 2021-09-21T05:56:42.92
IV.T0110.HHN. ML:1.5 0.00010336389500000001 1.6384 AML other m 2021-09-21T05:56:44.06
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