Earthquake with magnitude of ML 1.6 on date 23-09-2021 and time 10:44:05 (Italy) in region 2 km W Grottammare (AP)

A magnitude ML 1.6 earthquake occured in region: 2 km W Grottammare (AP), on

  • 23-09-2021 08:44:05 (UTC)
  • 23-09-2021 10:44:05 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.992, 13.851 at 20 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Grottammare AP 2 16006 16006
Cupra Marittima AP 4 5398 21404
San Benedetto del Tronto AP 6 47303 68707
Acquaviva Picena AP 6 3831 72538
Ripatransone AP 7 4309 76847
Monteprandone AP 8 12655 89502
Massignano AP 8 1638 91140
Campofilone FM 10 1916 93056
Montefiore dell'Aso AP 11 2123 95179
Monsampolo del Tronto AP 11 4611 99790
Pedaso FM 12 2800 102590
Spinetoli AP 13 7215 109805
Martinsicuro TE 13 16033 125838
Cossignano AP 13 978 126816
Colonnella TE 13 3734 130550
Altidona FM 14 3390 133940
Moresco FM 14 598 134538
Offida AP 14 5058 139596
Carassai AP 14 1100 140696
Castorano AP 14 2380 143076
Lapedona FM 15 1166 144242
Colli del Tronto AP 15 3668 147910
Monterubbiano FM 15 2230 150140
Controguerra TE 15 2436 152576
Castel di Lama AP 18 8634 161210
Petritoli FM 18 2335 163545
Appignano del Tronto AP 18 1785 165330
Corropoli TE 18 5045 170375
Alba Adriatica TE 18 12353 182728
Monte Vidon Combatte FM 19 433 183161
Nereto TE 19 5242 188403
Ancarano TE 19 1857 190260
Torano Nuovo TE 20 1611 191871
Castignano AP 20 2796 194667
Montalto delle Marche AP 20 2122 196789
Ponzano di Fermo FM 20 1674 198463

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km NE of Teramo (54892 inhabitants)
58 Km NW of Montesilvano (53738 inhabitants)
66 Km NW of Pescara (121014 inhabitants)
75 Km SE of Ancona (100861 inhabitants)
76 Km NW of Chieti (51815 inhabitants)
80 Km NE of L'Aquila (69753 inhabitants)
93 Km E of Foligno (57155 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.6 2021-09-23
08:44:05
42.9917 13.851 20 2021-09-23
08:54:42
Sala Sismica INGV-Roma 95777221
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-23 08:44:05 ± 0.28
Latitude 42.9917 ± 0.0081
Longitude 13.8510 ± 0.0160
Depth (km) 20 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95777221

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1317
Semi-minor axis of confidence ellipse (meter) 471
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 74
Circular confidence region, given by single value of horizontal uncertainty (meter) 1320
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 284
Number of associated phases, regardless of their use for origin computation 31
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.56208
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 9
Type of magnitude ML
Reference to an origin 95777221
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-23 08:54:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.COLB.HHZ. 2021-09-23T08:45:04.63 3.0 undecidable manual Pg 23.700001 0
IV.AGLI.HHZ. 2021-09-23T08:45:00.85 3.0 undecidable manual Sn -9.99 0
OT.OT17.EHZ. 2021-09-23T08:44:58.45 3.0 negative manual Pg 19.139999 0
IV.VBKN.HHZ. 2021-09-23T08:44:39.18 3.0 positive manual Pn -3.25 0
IV.ICAI.EHZ. 2021-09-23T08:44:38.61 3.0 negative manual Pn -2.32 0
IV.RIBO.EHZ.01 2021-09-23T08:44:37.05 3.0 undecidable manual Sn -3.88 0
IV.FDMO.HHZ. 2021-09-23T08:44:25.02 0.3 undecidable manual S 275 0.5594 100 0.15 68
IV.NRCA.HHZ. 2021-09-23T08:44:24.49 0.3 undecidable manual S 254 0.5621 100 -0.44 63
IV.CSP1.EHZ. 2021-09-23T08:44:22.60 0.6 undecidable manual S 282 0.482 103 -0.02 46
IV.TERO.HHZ. 2021-09-23T08:44:20.76 0.3 undecidable manual S 206 0.411 105 0.2 68
IV.MF5.EHZ. 2021-09-23T08:44:17.39 0.3 undecidable manual S 269 0.286 114 0.32 69
IV.NRCA.HHZ. 2021-09-23T08:44:16.45 0.1 undecidable manual P 254 0.5621 100 -0.31 86
IV.FDMO.HHZ. 2021-09-23T08:44:16.42 0.1 undecidable manual P 275 0.5594 100 -0.31 86
IV.CSP1.EHZ. 2021-09-23T08:44:15.52 0.3 undecidable manual P 282 0.482 103 0.09 70
IV.TERO.HHZ. 2021-09-23T08:44:14.39 0.1 undecidable manual P 206 0.411 105 0.15 92
IV.OFFI.HHZ. 2021-09-23T08:44:13.39 0.3 undecidable manual S 245 0.1331 138 0.04 75
IV.MF5.EHZ. 2021-09-23T08:44:12.40 0.1 undecidable manual P 269 0.286 114 0.18 95
IV.OFFI.HHZ. 2021-09-23T08:44:10.09 0.1 undecidable manual P 245 0.1331 138 0.01 100
GU.GSCL.HHZ. 2021-09-23T08:44:09.88 3.0 undecidable manual Sg 3.22 0
IV.APEC.HHZ. 2021-09-23T08:44:07.10 3.0 negative manual Pg 6.94 0
IV.FIR.HHZ. 2021-09-23T08:43:49.13 3.0 undecidable manual Pn -1.74 0
IV.MPPT.EHZ. 2021-09-23T08:43:45.22 3.0 positive manual Pn -2.65 0
IV.NDIM.HNZ. 2021-09-23T08:43:43.30 3.0 undecidable manual Pg 6.71 0
IV.QLNO.HHZ. 2021-09-23T08:43:43.29 3.0 positive manual Pg 5.14 0
IV.CADC.HNZ. 2021-09-23T08:43:35.96 3.0 undecidable manual Sg -4.02 0
IV.NEVI.HNZ. 2021-09-23T08:43:32.35 3.0 undecidable manual P -4.3 0
GU.LSD.HHZ. 2021-09-23T08:43:32.36 3.0 undecidable manual Pn -0.27 0
IV.VOBA.EHZ. 2021-09-23T08:43:27.09 3.0 positive manual P 0.03 0
IV.ORZI.HHZ. 2021-09-23T08:43:21.39 3.0 positive manual P -3.66 0
IV.EUCT.HNZ. 2021-09-23T08:43:21.80 3.0 undecidable manual P -3.32 0
CH.MUGIO.HHZ. 2021-09-23T08:43:16.22 3.0 undecidable manual P 0.86 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.6 7.33E-5 1.62 AML other m 2021-09-23T08:44:24.04
IV.NRCA.HHE. ML:1.4 5.035E-5 0.56 AML other m 2021-09-23T08:44:24.92
IV.FDMO.HHN. ML:1.3 4.23E-5 0.3 AML other m 2021-09-23T08:44:25.01
IV.FDMO.HHE. ML:1.2 3.16E-5 1.36 AML other m 2021-09-23T08:44:25.93
IV.OFFI.HHE. ML:1.8 0.000404891745 0.2816 AML other m 2021-09-23T08:44:13.48
IV.OFFI.HHN. ML:1.8 0.00037027685 0.2624 AML other m 2021-09-23T08:44:14.04
IV.TERO.HHE. ML:1.8 0.00017647801 0.3968 AML other m 2021-09-23T08:44:22.28
IV.TERO.HHN. ML:1.6 0.00010789874 0.16 AML other m 2021-09-23T08:44:20.86
IV.TERO.HNE. ML:1.8 0.0001637652 0.16 AML other m 2021-09-23T08:44:20.92
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