Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 08-09-2021 and time 09:28:30 (Italy) in region 6 km SE Cittareale (RI)

A magnitude ML 1.1 earthquake occured in region: 6 km SE Cittareale (RI), on

  • 08-09-2021 07:28:30 (UTC)
  • 08-09-2021 09:28:30 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.5840, 13.2130 at 14 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
Cittareale RI 6 482 482
Montereale AQ 7 2581 3063
Amatrice RI 8 2657 5720
Capitignano AQ 10 665 6385
Borbona RI 10 617 7002
Posta RI 12 694 7696
Accumoli RI 13 667 8363
Campotosto AQ 13 542 8905
Cagnano Amiterno AQ 14 1369 10274
Barete AQ 16 737 11011
Pizzoli AQ 18 4326 15337
Micigliano RI 20 127 15464

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km NW of L'Aquila (69753 inhabitants)
41 Km W of Teramo (54892 inhabitants)
46 Km E of Terni (111501 inhabitants)
59 Km SE of Foligno (57155 inhabitants)
76 Km NE of Guidonia Montecelio (88673 inhabitants)
77 Km NE of Tivoli (56533 inhabitants)
77 Km W of Montesilvano (53738 inhabitants)
83 Km W of Chieti (51815 inhabitants)
83 Km W of Pescara (121014 inhabitants)
89 Km SE of Perugia (166134 inhabitants)
93 Km E of Viterbo (67173 inhabitants)
97 Km NE of Roma (2864731 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 2021-09-08
07:28:30		 42.5837 13.213 15 2022-03-30
13:04:39		 Bollettino Sismico Italiano INGV 101397351
Reviewed
Rev100 		ML 1.1 2021-09-08
07:28:29		 42.5865 13.211 15 2021-09-08
07:45:48		 Sala Sismica INGV-Roma 95188531
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-08 07:28:30 ± 0.17
Latitude 42.5837 ± 0.0081
Longitude 13.2130 ± 0.0061
Depth (km) 15 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 101397351

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 788
Semi-minor axis of confidence ellipse (meter) 523
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 186
Circular confidence region, given by single value of horizontal uncertainty (meter) 790.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 100
Number of associated phases, regardless of their use for origin computation 32
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.29048
Number of stations at which the event was observed 26
Number of stations from which data was used for origin computation 6
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 95188531
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-08 07:45:48

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 101397351
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-24 00:06:31
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SERS.HHZ. 2021-09-08T07:30:17.89 3.0 undecidable manual Sn -0.29 0
IV.ZEN8.EHZ. 2021-09-08T07:30:15.61 3.0 undecidable manual Sg 14.54 0
HL.VLS.HHZ. 2021-09-08T07:30:10.79 3.0 undecidable manual Pn 3.51 0
IV.ILOS.HHZ. 2021-09-08T07:30:08.41 3.0 undecidable manual Sn -5.37 0
MN.TIR.HHZ. 2021-09-08T07:30:03.58 3.0 positive manual Pg 22.629999 0
MN.PDG.HHZ. 2021-09-08T07:29:50.95 3.0 undecidable manual Pg 18.030001 0
IV.ESCV.HHZ. 2021-09-08T07:29:46.89 3.0 negative manual Pg 12.3 0
IV.NDIM.HHZ. 2021-09-08T07:29:41.86 3.0 undecidable manual Sn -1.77 0
CR.ZAG.BHZ. 2021-09-08T07:29:39.32 3.0 undecidable manual Pg 14.2 0
IV.EUCT.HNZ. 2021-09-08T07:29:35.35 3.0 undecidable manual Pg 12.22 0
IV.ERC.EHZ. 2021-09-08T07:29:30.92 3.0 undecidable manual Pn 3.23 0
IV.OVO.HHZ. 2021-09-08T07:29:28.18 3.0 undecidable manual Sg 10.88 0
IV.SFI.HNZ. 2021-09-08T07:29:17.21 3.0 undecidable manual Sg 2.53 0
IV.FIR.HHZ. 2021-09-08T07:29:14.55 3.0 undecidable manual Sn -3.43 0
IV.ICAI.EHZ. 2021-09-08T07:28:59.55 3.0 positive manual Pg 6.41 0
IV.LPEL.HHZ. 2021-09-08T07:28:58.95 3.0 undecidable manual Sn 3.22 0
IT.FIE.HGZ. 2021-09-08T07:28:55.46 3.0 undecidable manual Pg 0.73 0
IV.VAGA.HHZ. 2021-09-08T07:28:45.32 3.0 undecidable manual Pn -1.77 0
IV.TERO.HHZ. 2021-09-08T07:28:41.03 0.6 undecidable manual S 82 32.2455 100 -0.12 48
IV.NRCA.HHZ. 2021-09-08T07:28:40.16 0.6 undecidable manual S 344 28.8489 102 -0.1 48
IV.MNTT.EHZ. 2021-09-08T07:28:39.00 3.0 undecidable manual P -1.79 0
IV.TOLF.HHZ. 2021-09-08T07:28:39.18 3.0 undecidable manual P -0.11 0
IV.MTRA.EHE. 2021-09-08T07:28:38.87 0.6 undecidable manual S 38 24.3534 105 -0.22 47
IV.SMA1.EHN. 2021-09-08T07:28:36.11 0.6 undecidable manual S 62 11.2776 133 0.11 50
IV.LNSS.HHZ. 2021-09-08T07:28:36.46 0.6 undecidable manual S 279 14.2746 124 -0.17 49
IV.TERO.HHZ. 2021-09-08T07:28:36.41 0.1 undecidable manual P 82 32.2455 100 -0.03 99
IV.RM33.EHN. 2021-09-08T07:28:35.06 0.6 undecidable manual S 179 8.2806 143 -0.41 48
IV.MTRA.EHE. 2021-09-08T07:28:35.30 0.3 undecidable manual P 38 24.3534 105 0.05 74
IV.NRCA.HHZ. 2021-09-08T07:28:35.89 0.3 undecidable manual P 344 28.8489 102 -0.04 73
IV.LNSS.HHZ. 2021-09-08T07:28:33.92 0.1 positive manual P 279 14.2746 124 0.09 100
IV.RM33.EHN. 2021-09-08T07:28:33.21 0.3 undecidable manual P 179 8.2806 143 0.05 76
IV.SMA1.EHN. 2021-09-08T07:28:33.76 0.1 undecidable manual P 62 11.2776 133 0.29 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LNSS.HHN. ML:1.1 0.00011449999999999999 0.18 AML other m 2021-09-08T07:28:36.71
IV.LNSS.HHE. ML:1.3 0.00016649999999999998 1.16 AML other m 2021-09-08T07:28:37.76
IV.NRCA.HNN. ML:1.5 0.0001440476 0.8224 AML other m 2021-09-08T07:28:40.56
IV.NRCA.HHE. ML:0.8 0.00003195 0.78 AML other m 2021-09-08T07:28:40.79
IV.NRCA.HNE. ML:1.2 0.00007221778500000001 0.3648 AML other m 2021-09-08T07:28:41.30
IV.NRCA.HHN. ML:0.8 0.0000292 0.08 AML other m 2021-09-08T07:28:41.30
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