Earthquake with magnitude of ML 0.9 on date 01-12-2021 and time 02:34:22 (UTC) in region 5 km S Acquasanta Terme (AP)

A magnitude ML 0.9 earthquake occured in region: 5 km S Acquasanta Terme (AP), on

  • 01-12-2021 02:34:22 (UTC)
  • 01-12-2021 03:34:22 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.73, 13.394 at 15 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
Acquasanta Terme AP 5 2916 2916
Valle Castellana TE 9 977 3893
Arquata del Tronto AP 9 1178 5071
Rocca Santa Maria TE 12 537 5608
Accumoli RI 13 667 6275
Montegallo AP 14 523 6798
Amatrice RI 14 2657 9455
Cortino TE 15 656 10111
Roccafluvione AP 16 2010 12121
Venarotta AP 19 2066 14187
Campotosto AQ 19 542 14729
Montemonaco AP 20 604 15333
Palmiano AP 20 196 15529

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km W of Teramo (54892 inhabitants)
42 Km N of L'Aquila (69753 inhabitants)
62 Km E of Foligno (57155 inhabitants)
64 Km E of Terni (111501 inhabitants)
66 Km W of Montesilvano (53738 inhabitants)
73 Km W of Pescara (121014 inhabitants)
76 Km NW of Chieti (51815 inhabitants)
92 Km E of Perugia (166134 inhabitants)
98 Km NE of Guidonia Montecelio (88673 inhabitants)
98 Km NE of Tivoli (56533 inhabitants)
99 Km S of Ancona (100861 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 earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 0.9 2021-12-01
02:34:22
42.7298 13.3942 15 2021-12-01
02:46:36
Sala Sismica INGV-Roma 97994021
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-01 02:34:22 ± 0.1
Latitude 42.7298 ± 0.0045
Longitude 13.3942 ± 0.0073
Depth (km) 15 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97994021

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 658
Semi-minor axis of confidence ellipse (meter) 171
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 59
Circular confidence region, given by single value of horizontal uncertainty (meter) 660
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 114
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.28958
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0
Num. used stations 4
Type of magnitude ML
Reference to an origin 97994021
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-01 02:46:36
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MRVN.HHZ. 2021-12-01T02:35:38.17 3.0 undecidable manual Sn -0.94 0
IV.SIRI.HNZ. 2021-12-01T02:35:12.47 3.0 undecidable manual Pn 0.39 0
IX.SCL3.EHZ.02 2021-12-01T02:35:04.37 3.0 negative manual Pn 0.16 0
IV.MF5.EHZ. 2021-12-01T02:34:33.34 0.3 undecidable manual S 11 0.2626 103 0.61 65
IV.LNSS.HHZ. 2021-12-01T02:34:33.56 0.3 undecidable manual S 244 0.2896 101 0.05 73
IV.RM33.EHZ. 2021-12-01T02:34:32.69 0.3 undecidable manual S 211 0.2572 103 0.11 72
IV.MC2.EHZ. 2021-12-01T02:34:32.05 0.6 undecidable manual S 320 0.2356 105 0.09 49
IV.NRCA.HHZ. 2021-12-01T02:34:31.62 0.3 undecidable manual S 297 0.2302 106 -0.18 72
IV.TERO.HHZ. 2021-12-01T02:34:30.53 0.3 undecidable manual S 125 0.188 112 -0.08 75
IV.MMO1.EHZ. 2021-12-01T02:34:30.12 0.3 undecidable manual S 344 0.1763 114 -0.19 72
IV.LNSS.HHZ. 2021-12-01T02:34:29.05 0.3 undecidable manual P 244 0.2896 101 0.24 70
IV.MC2.EHZ. 2021-12-01T02:34:28.06 0.3 undecidable manual P 320 0.2356 105 0.15 73
IV.SMA1.EHZ. 2021-12-01T02:34:28.80 0.3 undecidable manual S 204 0.1079 132 0.2 72
IV.RM33.EHZ. 2021-12-01T02:34:28.05 0.1 undecidable manual P 211 0.2572 103 -0.22 95
IV.MF5.EHZ. 2021-12-01T02:34:28.49 0.1 undecidable manual P 11 0.2626 103 0.14 97
IV.NRCA.HHZ. 2021-12-01T02:34:27.49 0.1 undecidable manual P 297 0.2302 106 -0.33 93
IV.TERO.HHZ. 2021-12-01T02:34:27.01 0.1 undecidable manual P 125 0.188 112 -0.12 99
IV.SMA1.EHZ. 2021-12-01T02:34:26.01 0.1 undecidable manual P 204 0.1079 132 0.04 100
IV.MMO1.EHZ. 2021-12-01T02:34:26.71 0.1 undecidable manual P 344 0.1763 114 -0.25 95
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:0.9 6.2619785E-5 0.0992 AML other m 2021-12-01T02:34:28.90
IV.SMA1.EHN. ML:0.9 6.846303E-5 0.12 AML other m 2021-12-01T02:34:28.90
IX.SCL3.HNE.01 ML:4 0.001475 0.1 AML other m 2021-12-01T02:35:09.44
IX.SCL3.EHE.02 ML:4 0.00138 0.58 AML other m 2021-12-01T02:35:09.44
IX.SCL3.EHN.02 ML:4.3 0.003085 0.26 AML other m 2021-12-01T02:35:09.52
IX.SCL3.HNN.01 ML:4.4 0.00311 0.26 AML other m 2021-12-01T02:35:09.52
IV.SIRI.HNE. ML:3.7 0.000458 1.18 AML other m 2021-12-01T02:36:23.08
IV.SIRI.HNN. ML:3.8 0.000497 1.16 AML other m 2021-12-01T02:36:23.08
IV.NRCA.HHE. ML:0.8 3.564043E-5 0.08 AML other m 2021-12-01T02:34:31.92
IV.NRCA.HHN. ML:0.9 3.8821265E-5 0.1008 AML other m 2021-12-01T02:34:31.73
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