Earthquake Costa Ligure centro-occidentale (Savona), Magnitude ML 2.1, 31 August 2018 time 20:04:12 (Timezone Italy)

A magnitude ML 2.1 earthquake occured in region: Costa Ligure centro occidentale (Savona), on

31-08-2018 18:04:12 (UTC)
31-08-2018 20:04:12 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.8700, 8.3240 at 7 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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Display location by

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).

Municipality	Region	Distance (km)	Inhabitants	Cumulative Inhabitants
Laigueglia	SV	18	1810	1810
Andora	SV	18	7552	9362
Cervo	IM	18	1187	10549
San Bartolomeo al Mare	IM	19	3129	13678
Alassio	SV	20	10934	24612
Diano Marina	IM	20	5977	30589

Municipalities with at least 50000 inhabitants

An earthquake occurred to

44 Km E of Sanremo (54807 inhabitants)

50 Km S of Savona (61345 inhabitants)

78 Km SW of Genova (586655 inhabitants)

85 Km SE of Cuneo (56081 inhabitants)

Recent and historical seismicity

Not available maps for this sismic event.

Seismic hazard

Not available maps for this sismic event.

Shakemap

Not available maps for this sismic event.

Felt maps

Not available maps for this sismic event.

Locations history

Type	Magnitude	Date and Time (UTC)	Latitude	Longitude	Depth (km)	Published time (UTC)	Author	Location ID
Bulletin Rev1000	ML 2.1	2018-08-31 18:04:12	43.8703	8.3235	7	2019-04-24 14:51:14	Bollettino Sismico Italiano INGV	66967061
Reviewed Rev100	ML 2.1	2018-08-31 18:04:12	43.8712	8.3187	7	2018-08-31 18:14:39	Sala Sismica INGV-Roma	60433221

Preferred location and magnitude until now.

Origin information

Origin

Field	Value
Time (UTC)	2018-08-31 18:04:12 ± 0.19
Latitude	43.8703 ± 0.0081
Longitude	8.3235 ± 0.0087
Depth (km)	7 ± 1 (from location)
Evaluation mode of Origin	manual
Evaluation status of Origin	reviewed
Version	1000 -> BULLETIN-INGV
Event type	earthquake
Origin ID	66967061

Uncertainty

Field	Value
Preferred uncertainty description	uncertainty ellipse
Semi-major axis of confidence ellipse (meter)	927
Semi-minor axis of confidence ellipse (meter)	266
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)	337
Circular confidence region, given by single value of horizontal uncertainty (meter)	930.0
Confidence level of the uncertainty (%)	68

Quality

Field	Value
Largest azimuthal gap in station distribution as seen from epicenter (degree)	184
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)	0.28
Epicentral distance of station closest to the epicenter (degree)	0.30397
Epicentral distance of station farthest from the epicenter (degree)	1.34718
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:2.1

Field	Value
Value	2.1
Uncertainty	0.2
Num. used stations	19
Type of magnitude	ML
Reference to an origin	66967061
Agency	INGV
Autore	Bollettino Sismico Italiano INGV
Time of creation (UTC)	2019-03-27 11:38:44

ML:2.1

Field	Value
Value	2.1
Uncertainty	0.2
Num. used stations	20
Type of magnitude	ML
Reference to an origin	60433221
Agency	INGV
Autore	Sala Sismica INGV-Roma
Time of creation (UTC)	2018-08-31 18:14:39

Picking and Arrival

SCNL	Time	Uncertainty	Polarity	Evaluation_mode	Phase	Azimuth	Distance(km)	Takeoff_angle	Residual	Weight
GU.PZZ.HHZ.	2018-08-31T18:04:48.25	0.1	undecidable	manual	S	307	119.1918	50	0.31	80
GU.STV.HHZ.	2018-08-31T18:04:39.68	0.6	undecidable	manual	S	298	89.7435	50	-0.4	42
GU.ENR.HHZ.	2018-08-31T18:04:37.95	0.6	undecidable	manual	S	299	82.1511	50	-0.1	45
GU.EQUI.HHN.	2018-08-31T18:04:37.40	0.6	undecidable	manual	P	77	149.5392	50	-0.35	37
GU.PCP.HHZ.	2018-08-31T18:04:36.08	0.6	undecidable	manual	S	13	76.4679	50	-0.46	42
GU.PZZ.HHZ.	2018-08-31T18:04:33.88	0.1	undecidable	manual	P	307	119.1918	50	0.82	68
FR.SAOF.HHZ.	2018-08-31T18:04:32.22	0.6	undecidable	manual	S	282	62.8926	50	-0.68	40
GU.BURY.HNN.	2018-08-31T18:04:32.23	0.6	undecidable	manual	S	261	62.0934	50	-0.47	43
IV.MSSA.HHZ.	2018-08-31T18:04:30.62	0.3	undecidable	manual	P	62	107.2149	50	-0.6	57
IV.QLNO.HHZ.	2018-08-31T18:04:29.25	0.6	undecidable	manual	S	2	50.4162	50	-0.32	46
GU.STV.HHZ.	2018-08-31T18:04:28.81	0.1	undecidable	manual	P	298	89.7435	50	0.28	85
GU.ENR.HHZ.	2018-08-31T18:04:27.69	0.6	undecidable	manual	P	299	82.1511	50	0.34	43
GU.RNCA.HHZ.	2018-08-31T18:04:27.75	0.6	undecidable	manual	P	37	83.25	50	0.22	44
GU.PCP.HHZ.	2018-08-31T18:04:26.76	0.1	undecidable	manual	P	13	76.4679	50	0.28	88
GU.CANO.HHZ.	2018-08-31T18:04:25.97	0.6	undecidable	manual	S	350	38.0286	100	-0.19	48
GU.BURY.HNN.	2018-08-31T18:04:24.41	0.3	undecidable	manual	P	261	62.0934	50	0.14	70
GU.RORO.HHZ.	2018-08-31T18:04:24.62	0.6	undecidable	manual	S	323	33.744	102	-0.09	49
FR.SAOF.HHZ.	2018-08-31T18:04:24.52	0.3	undecidable	manual	P	282	62.8926	50	0.14	70
IV.IMI.HHZ.	2018-08-31T18:04:24.73	0.6	undecidable	manual	S	278	34.6431	101	-0.29	47
GU.GBOS.HHZ.	2018-08-31T18:04:23.50	0.3	undecidable	manual	P	317	56.3991	50	0.11	71
IV.QLNO.HHZ.	2018-08-31T18:04:22.55	0.3	undecidable	manual	P	2	50.4162	50	0.09	72
GU.CANO.HHZ.	2018-08-31T18:04:20.60	0.1	undecidable	manual	P	350	38.0286	100	0.11	98
IV.IMI.HHZ.	2018-08-31T18:04:19.62	0.1	undecidable	manual	P	278	34.6431	101	-0.21	96
GU.RORO.HHZ.	2018-08-31T18:04:19.63	0.1	undecidable	manual	P	323	33.744	102	-0.02	100

Station Magnitude and Amplitude

SCNL	mag	Generic_amplitude	Period	Type	Category	Unit	Time_window_reference
IV.IMI.HHE.	ML:2.1	0.0005949999999999999	0.74	AML	other	m	2018-08-31T18:04:25.61
GU.RORO.HHE.	ML:1.9	0.00035918930000000004	0.064	AML	other	m	2018-08-31T18:04:26.70
GU.RORO.HHN.	ML:1.8	0.00026091319999999995	0.1024	AML	other	m	2018-08-31T18:04:27.28
GU.CANO.HHE.	ML:2.1	0.0004796804	0.2176	AML	other	m	2018-08-31T18:04:29.26
GU.CANO.HHN.	ML:2.1	0.0005281239499999999	0.2176	AML	other	m	2018-08-31T18:04:29.47
IV.QLNO.HHE.	ML:2.2	0.00037796825	0.1408	AML	other	m	2018-08-31T18:04:30.00
IV.QLNO.HHN.	ML:2.1	0.00036130655	0.2688	AML	other	m	2018-08-31T18:04:31.83
GU.GBOS.HHE.	ML:1.5	0.000064983615	0.2048	AML	other	m	2018-08-31T18:04:33.25
FR.SAOF.HHE.00	ML:2.2	0.00029138225	0.1408	AML	other	m	2018-08-31T18:04:33.40
GU.GBOS.HHN.	ML:1.6	0.00008507071499999999	0.3072	AML	other	m	2018-08-31T18:04:35.12
FR.SAOF.HHN.00	ML:2.2	0.0002980813	0.1792	AML	other	m	2018-08-31T18:04:35.21
GU.PCP.HHE.	ML:2.2	0.00023369895	0.2176	AML	other	m	2018-08-31T18:04:37.75
GU.PCP.HHN.	ML:2.1	0.000189749	0.2176	AML	other	m	2018-08-31T18:04:37.75
GU.ENR.HHN.	ML:2.3	0.0002671344	0.1024	AML	other	m	2018-08-31T18:04:38.26
GU.ENR.HHE.	ML:2.1	0.0001526379	0.1024	AML	other	m	2018-08-31T18:04:40.40
GU.STV.HHN.	ML:2.2	0.0001855	1.46	AML	other	m	2018-08-31T18:04:42.88
GU.STV.HHE.	ML:2.2	0.00019515585	0.192	AML	other	m	2018-08-31T18:04:42.96
GU.PZZ.HHE.	ML:2.5	0.00023035824999999998	0.3328	AML	other	m	2018-08-31T18:04:50.17
GU.PZZ.HHN.	ML:2.5	0.00022338239999999997	0.2304	AML	other	m	2018-08-31T18:04:51.32

TDMT - Time Domain Moment Tensor

Not available TDMT solution for this seismic event.

Fault Plane solutions in the area

Not available maps for this sismic event.

Download

Type	Description	Link
QuakeML - small	Event, Origin, FocalMechanism	Download
QuakeML - full	Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude	Download
Waveforms	Seismic signals in miniseed + resp format	Download

Earthquake with magnitude of ML 2.1 on date 31-08-2018 and time 20:04:12 (Italy) in region Costa Ligure centro occidentale (Savona)

Municipalities within 20 km from the epicenter

Municipalities with at least 50000 inhabitants

Origin

Uncertainty

Quality

ML:2.1

ML:2.1