Earthquake 1 km SE Colonna (RM), Magnitude Md 2.0, 25 October 1989 time 21:22:19 (Timezone UTC)

A magnitude Md 2.0 earthquake occured in region: 1 km SE Colonna (RM), on

25-10-1989 21:22:19 (UTC)
25-10-1989 22:22:19 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.8240, 12.7590 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.

Did you feel it? Fill in the questionnaire.

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
Colonna	RM	1	4287	4287
Monte Compatri	RM	2	11978	16265
Rocca Priora	RM	3	11962	28227
Monte Porzio Catone	RM	4	8693	36920
San Cesareo	RM	4	15153	52073
Zagarolo	RM	6	17843	69916
Frascati	RM	7	22087	92003
Gallicano nel Lazio	RM	8	6334	98337
Rocca di Papa	RM	8	17034	115371
Grottaferrata	RM	8	20327	135698
Marino	RM	10	43026	178724
Palestrina	RM	11	21672	200396
Labico	RM	11	6379	206775
Castel San Pietro Romano	RM	12	902	207677
Nemi	RM	12	1943	209620
Lariano	RM	12	13432	223052
Castel Gandolfo	RM	12	8997	232049
Ciampino	RM	13	38412	270461
Albano Laziale	RM	13	41715	312176
Poli	RM	13	2418	314594
Ariccia	RM	14	19407	334001
Genzano di Roma	RM	14	23970	357971
Casape	RM	14	744	358715
San Gregorio da Sassola	RM	14	1619	360334
Valmontone	RM	14	15959	376293
Cave	RM	14	11287	387580
Velletri	RM	15	53303	440883
Rocca di Cave	RM	16	377	441260
Tivoli	RM	16	56533	497793
Artena	RM	16	14276	512069
Lanuvio	RM	17	13632	525701
Capranica Prenestina	RM	17	351	526052
Genazzano	RM	18	6036	532088
Pisoniano	RM	19	770	532858
Castel Madama	RM	19	7399	540257
San Vito Romano	RM	20	3273	543530
Guidonia Montecelio	RM	20	88673	632203

Municipalities with at least 50000 inhabitants

An earthquake occurred to

15 Km N of Velletri (53303 inhabitants)

16 Km S of Tivoli (56533 inhabitants)

20 Km S of Guidonia Montecelio (88673 inhabitants)

24 Km E of Roma (2864731 inhabitants)

27 Km NE of Aprilia (73446 inhabitants)

27 Km NE of Pomezia (62966 inhabitants)

41 Km N of Latina (125985 inhabitants)

43 Km N of Anzio (54211 inhabitants)

44 Km E of Fiumicino (78395 inhabitants)

79 Km SW of L'Aquila (69753 inhabitants)

83 Km S of Terni (111501 inhabitants)

85 Km E of Civitavecchia (52991 inhabitants)

85 Km SE of Viterbo (67173 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	Md 2.0	1989-10-25 21:22:19	41.824	12.759	10	2013-07-15 08:41:04	Bollettino Sismico Italiano INGV	102969

Preferred location and magnitude until now.

Origin information

Origin

Field	Value
Time (UTC)	1989-10-25 21:22:19 ± 0.155
Latitude	41.8240 ± 0.0167
Longitude	12.7590 ± 0.0180
Depth (km)	10 (operator assigned)
Evaluation mode of Origin	manual
Evaluation status of Origin	reviewed
Version	1000 -> BULLETIN-VAX
Event type	earthquake
Origin ID	102969

Uncertainty

Field	Value
Preferred uncertainty description	horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter)	2383.2
Confidence level of the uncertainty (%)	68

Quality

Field	Value
Largest azimuthal gap in station distribution as seen from epicenter (degree)	107
Number of associated phases, regardless of their use for origin computation	8
Number of defining phases	8
RMS of the travel time residuals of the arrivals used for the origin computation (sec)	0.3
Epicentral distance of station closest to the epicenter (degree)	0.00032
Epicentral distance of station farthest from the epicenter (degree)	0.00712
Number of stations at which the event was observed	5
Number of stations from which data was used for origin computation	5

Magnitude information

Md:2.0

Field	Value
Value	2.0
Uncertainty
Num. used stations	3
Type of magnitude	Md
Reference to an origin	102969
Agency	INGV
Autore	Bollettino Sismico Italiano INGV
Time of creation (UTC)	2013-01-04 18:35:57

Picking and Arrival

SCNL	Time	Uncertainty	Polarity	Evaluation_mode	Phase	Azimuth	Distance(km)	Residual	Weight
--.SDI.Z.	1989-10-25T21:22:34.43	10.0	undecidable	manual	PG	97	0.7881	-0.92	0.1
--.MNS.Z.	1989-10-25T21:22:31.20	10.0	undecidable	manual	PG	354	0.555	0.08	1
--.CP9.Z.	1989-10-25T21:22:26.50	10.0	undecidable	manual	SG	75	0.1443	0.23	0.4
--.RDP.Z.	1989-10-25T21:22:24.25	10.0	undecidable	manual	SG	205	0.0666	0.23	0.6
--.CP9.Z.	1989-10-25T21:22:23.66	10.0	undecidable	manual	PG	75	0.1443	0.22	1.2
--.RDP.Z.	1989-10-25T21:22:22.58	10.0	undecidable	manual	PG	205	0.0666	0.44	0.9
--.RMP.Z.	1989-10-25T21:22:22.89	10.0	undecidable	manual	SG	253	0.0333	-0.54	0.4
--.RMP.Z.	1989-10-25T21:22:21.69	10.0	negative	manual	PG	253	0.0333	-0.11	3.3

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

Earthquake with magnitude of Md 2.0 on date 25-10-1989 and time 21:22:19 (UTC) in region 1 km SE Colonna (RM)

Municipalities within 20 km from the epicenter

Municipalities with at least 50000 inhabitants

Origin

Uncertainty

Quality

Md:2.0